Circuit Breakers with Communication
Capability
SENTRON WL and SENTRON VL
MODBUS
System Manual • 07/2011
Low-Voltage Power Distribution and
Electrical Installation Technology
3WL/3VL circuit breakers with
communication capability - Modbus
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SENTRON
Protection devices
3WL/3VL circuit breakers with
communication capability - Modbus
System Manual
07/2011
A5E02126891-02
Introduction and overview
1
General information
2
SENTRON WL
3
SENTRON VL
4
Zone Selective Interlocking
5
Modbus RTU data transfer
6
powerconfig
7
Data library
8
List of abbreviations
A
Legal information
Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
with a safety alert symbol, indicates that minor personal injury can result if proper precautions are not taken.
CAUTION
without a safety alert symbol, indicates that property damage can result if proper precautions are not taken.
NOTICE
indicates that an unintended result or situation can occur if the relevant information is not taken into account.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by personnel qualified for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.
Siemens AG
Industry Sector
Postfach 48 48
90026 NÜRNBERG
GERMANY
Order number: 3ZX1012-0WL10-AC1
Ⓟ 08/2011
Copyright © Siemens AG 2009.
Technical data subject to change
3WL/3VL circuit breakers with communication capability - Modbus
System Manual, 07/2011, A5E02126891-02 3
Table of contents
1 Introduction and overview.......................................................................................................................... 9
1.1 General information .......................................................................................................................9
1.1.1 Structure of the manual..................................................................................................................9
1.1.2 Introduction ....................................................................................................................................9
1.1.3 SENTRON circuit breakers ..........................................................................................................10
1.2 Bus systems.................................................................................................................................12
1.2.1 Modbus RTU................................................................................................................................12
1.2.2 Ethernet........................................................................................................................................13
1.2.3 PROFIBUS DP.............................................................................................................................14
1.2.4 Communication structure of the SENTRON circuit breakers.......................................................17
2 General information ................................................................................................................................. 19
2.1 Other system manuals and literature...........................................................................................19
2.2 Approvals .....................................................................................................................................19
2.3 Standards and approvals .............................................................................................................19
2.4 Orientation aids............................................................................................................................20
2.5 Up-to-the-minute information at all times.....................................................................................20
2.6 Scope...........................................................................................................................................20
3 SENTRON WL......................................................................................................................................... 21
3.1 Introduction and overview ............................................................................................................21
3.1.1 The CubicleBUS ..........................................................................................................................21
3.1.2 Communications capability of electronic trip units (ETU) ............................................................21
3.1.3 Function overview of the overcurrent tripping system .................................................................22
3.1.4 Availability of the data on the CubicleBUS ..................................................................................27
3.1.5 Brief description of SENTRON WL ..............................................................................................29
3.2 COM16 and BSS module.............................................................................................................32
3.2.1 COM16 Modbus RTU module......................................................................................................32
3.2.2 Connection of the COM16 module ..............................................................................................33
3.2.3 Write protection (WriteEnable).....................................................................................................38
3.2.4 Data exchange via the COM16....................................................................................................38
3.2.5 Breaker Status Sensor (BSS) ......................................................................................................41
3.3 Metering functions........................................................................................................................42
3.3.1 Metering function PLUS...............................................................................................................42
3.3.2 Voltage transformer .....................................................................................................................48
3.3.3 Delay of the threshold warning ....................................................................................................52
3.4 Functions and parameters ...........................................................................................................52
3.4.1 Important functions and parameters for communication .............................................................52
3.4.2 Load management .......................................................................................................................53
3.4.3 Extended protection function .......................................................................................................54
3.4.4 Threshold values..........................................................................................................................55
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3.4.5 Lower limit of power transmission............................................................................................... 55
3.4.6 Direction of incoming supply ....................................................................................................... 55
3.4.7 Events and tripping operations ................................................................................................... 56
3.5 External CubicleBUS modules.................................................................................................... 57
3.5.1 General information..................................................................................................................... 57
3.5.1.1 Rotary coding switch................................................................................................................... 58
3.5.1.2 Installing the CubicleBUS modules............................................................................................. 58
3.5.1.3 Connection of the power supply.................................................................................................. 59
3.5.1.4 Maximum configuration of the CubicleBUS ................................................................................59
3.5.1.5 Installation guidelines for the CubicleBUS.................................................................................. 60
3.5.1.6 Connection of external CubicleBUS modules............................................................................. 60
3.5.1.7 LED indicator............................................................................................................................... 63
3.5.1.8 Test of the digital input and output modules ............................................................................... 64
3.5.2 Digital input module..................................................................................................................... 66
3.5.2.1 Parameter set changeover.......................................................................................................... 67
3.5.2.2 Technical data............................................................................................................................. 68
3.5.3 Digital output module with rotary coding switch..........................................................................68
3.5.3.1 Technical data............................................................................................................................. 70
3.5.4 Configuration of the digital output module .................................................................................. 71
3.5.4.1 Technical data............................................................................................................................. 71
3.5.4.2 LED indicator............................................................................................................................... 73
3.5.5 Analog output module ................................................................................................................. 74
3.5.5.1 Selecting the measured values................................................................................................... 75
3.5.5.2 Test function................................................................................................................................ 79
3.5.5.3 Technical data............................................................................................................................. 79
3.6 Measuring accuracy .................................................................................................................... 80
3.6.1 3WL breaker measuring accuracy .............................................................................................. 80
3.7 External current consumption with CubicleBUS ......................................................................... 80
3.7.1 Power required by a SENTRON WL with CubicleBUS............................................................... 80
3.7.2 Selecting the power supply ......................................................................................................... 82
4 SENTRON VL.......................................................................................................................................... 85
4.1 Brief description .......................................................................................................................... 85
4.1.1 Brief description of SENTRON VL .............................................................................................. 85
4.1.2 Overview of the accessories ....................................................................................................... 86
4.1.3 Properties of the trip units ........................................................................................................... 88
4.1.4 Electronic overcurrent tripping systems ...................................................................................... 88
4.1.5 Protection functions..................................................................................................................... 88
4.1.6 Data transfer by means of Modbus RTU .................................................................................... 91
4.2 COM21 connection ..................................................................................................................... 93
4.2.1 Data exchange with the COM21 ................................................................................................. 93
4.2.2 Setting the MODBUS address of the COM21............................................................................. 94
4.2.3 COM21 pin assignment............................................................................................................... 95
4.2.4 Write protection with COM21 ...................................................................................................... 96
4.2.5 Communication connection to the ETU ......................................................................................96
4.2.6 Connecting the optional motorized operating mechanism to COM21 ........................................ 97
4.2.7 LED display on the COM21....................................................................................................... 102
5 Zone Selective Interlocking.................................................................................................................... 105
5.1 ZSI............................................................................................................................................. 105
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3WL/3VL circuit breakers with communication capability - Modbus
System Manual, 07/2011, A5E02126891-02 5
5.1.1 Selectivity...................................................................................................................................105
5.1.2 Time selectivity...........................................................................................................................105
5.1.3 ZSI function................................................................................................................................106
5.1.4 Operating principle.....................................................................................................................107
5.1.5 Course over time........................................................................................................................107
5.1.5.1 Condition ZSI = ON and presence of a short-circuit (S) ............................................................107
5.1.5.2 Condition ZSI = ON and presence of a ground fault (G) ...........................................................108
5.2 Examples ...................................................................................................................................109
5.2.1 Function example.......................................................................................................................109
5.2.2 Tabular representation...............................................................................................................110
5.2.2.1 Short-circuit................................................................................................................................110
5.2.2.2 Ground fault ...............................................................................................................................110
5.2.2.3 Example of 3 grading levels without coupling switch.................................................................111
5.2.2.4 Cancelation of the ZSI OUT signal ............................................................................................112
5.2.2.5 Coupling switch..........................................................................................................................113
5.2.2.6 Wiring example ..........................................................................................................................114
5.2.2.7 Circuit breakers without ZSI function .........................................................................................116
5.3 SENTRON 3WL .........................................................................................................................117
5.3.1 Technical data............................................................................................................................117
5.3.2 Applications................................................................................................................................118
5.3.3 Configuration..............................................................................................................................118
5.3.4 Connection.................................................................................................................................118
5.3.5 Test function...............................................................................................................................118
5.3.6 LED ............................................................................................................................................118
5.4 SENTRON 3VL ..........................................................................................................................119
5.4.1 COM20/COM 21 ........................................................................................................................119
5.4.2 Technical data............................................................................................................................119
5.4.3 Applications................................................................................................................................120
5.4.4 Configuration..............................................................................................................................120
5.4.5 Connection.................................................................................................................................120
5.4.6 LED ............................................................................................................................................121
6 Modbus RTU data transfer..................................................................................................................... 123
6.1 Integration of the circuit breakers into a communication system...............................................123
6.2 Modbus RTU..............................................................................................................................123
6.2.1 Structure of the job message frame...........................................................................................123
6.2.2 Character frames .......................................................................................................................124
6.2.3 Communication parameter settings ...........................................................................................125
6.2.4 Data storage...............................................................................................................................126
6.2.4.1 Control bytes..............................................................................................................................126
6.2.4.2 Status bytes ...............................................................................................................................127
6.2.4.3 Basic type data ..........................................................................................................................128
6.2.4.4 Value buffer area .......................................................................................................................130
6.2.5 Function codes...........................................................................................................................131
6.2.5.1 Function "01 – Read output bits"................................................................................................131
6.2.5.2 Function "02 – Read input" ........................................................................................................132
6.2.5.3 Function "03 – Read value buffer area" .....................................................................................133
6.2.5.4 Function "04 – Read basic type data"........................................................................................134
6.2.5.5 Function "05 – Write individual output" ......................................................................................135
6.2.5.6 Function "07 – Read diagnostic information" .............................................................................136
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6.2.5.7 Function "08 – Diagnostics" ...................................................................................................... 137
6.2.5.8 Function "11 – Get number of messages" ................................................................................ 139
6.2.5.9 Function code "12 – Communication events" ........................................................................... 140
6.2.5.10 Function "15 – Write output block" ............................................................................................ 141
6.2.5.11 Function "16 – Write value buffer area" .................................................................................... 142
6.2.5.12 Summary of exception messages............................................................................................. 143
6.3 Transition to TCP/IP networks .................................................................................................. 145
7 powerconfig ........................................................................................................................................... 147
7.1 Brief description ........................................................................................................................ 147
7.2 Delivery form ............................................................................................................................. 148
7.3 Software requirements.............................................................................................................. 148
7.4 Online with powerconfig............................................................................................................ 149
7.5 Offline with powerconfig............................................................................................................ 149
7.6 User interface............................................................................................................................ 150
7.7 "Overview" view ........................................................................................................................ 151
7.8 "Parameters" view..................................................................................................................... 153
7.9 Communication link to the circuit breakers ............................................................................... 154
7.9.1 USB/RS485 adapter as point-to-point link ................................................................................ 154
7.9.2 USB/RS485 adapter.................................................................................................................. 155
7.9.3 LAN/RS485 gateway................................................................................................................. 156
8 Data library ............................................................................................................................................ 157
8.1 The data library ......................................................................................................................... 157
8.2 Chapter overview ...................................................................................................................... 157
8.3 Scaling....................................................................................................................................... 158
8.4 Abbreviations of the data sources............................................................................................. 158
8.5 Units .......................................................................................................................................... 159
8.6 Function classes ....................................................................................................................... 159
8.6.1 Function classes of the data points........................................................................................... 159
8.6.2 Data points for controlling the SENTRON circuit breakers ....................................................... 160
8.6.3 Data points for detailed diagnostics of the SENTRON circuit breakers.................................... 160
8.6.4 Data points for identifying the SENTRON circuit breakers ....................................................... 162
8.6.5 Data points for measured values current ..................................................................................164
8.6.6 Data points for measured values voltage..................................................................................166
8.6.7 Data points for measured values power ................................................................................... 168
8.6.8 Data points for other measured values ..................................................................................... 170
8.6.9 Data points for the time stamp (TS) of the measured values ................................................... 172
8.6.10 Parameters of the SENTRON circuit breakers (primary protection function) ........................... 174
8.6.11 Parameters of the SENTRON circuit breakers (extended protection function) ........................ 176
8.6.12 Parameters of the SENTRON circuit breakers (parameters for threshold value alarms)......... 178
8.6.13 Parameters of the SENTRON circuit breakers (communication, measured value
adjustment, etc.)........................................................................................................................ 181
8.7 Register blocks for SENTRON WL ........................................................................................... 182
8.7.1 Register block RB 51 main overview ........................................................................................ 182
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3WL/3VL circuit breakers with communication capability - Modbus
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8.7.2 Register block RB 64 data of the harmonic analysis .................................................................185
8.7.3 Register block RB 68 data of the CubicleBUS module..............................................................186
8.7.4 Register block RB 69 status of the modules..............................................................................187
8.7.5 Register block RB 72 min. and max. measured values.............................................................189
8.7.6 Register block RB 73 min. and max. measured values of the voltages ....................................193
8.7.7 Register block RB 74 min. and max. measured values of the powers ......................................196
8.7.8 Register block RB 76 min. and max. measured values of the frequency and the THD ............198
8.7.9 Register block RB 77 min. and max. measured values of the temperatures ............................200
8.7.10 Register block RB 91 statistics information ...............................................................................201
8.7.11 Register block RB 92 diagnostics data ......................................................................................203
8.7.12 Register block RB 93 control of the circuit breakers..................................................................205
8.7.13 Register block RB 94 current measured values ........................................................................207
8.7.14 Register block RB 97 Detailed identification..............................................................................213
8.7.15 Register block RB 100 Identification in overview.......................................................................215
8.7.16 Register block RB 128 parameters of the metering function and extended protection
function.......................................................................................................................................216
8.7.17 Register block RB 129 parameters of the protection function and settings for load
shedding and load pick up .........................................................................................................219
8.7.18 Register block RB 131 switching the parameters for the extended protection function and
the threshold values on and off..................................................................................................223
8.7.19 Register block RB 130 parameters for the threshold values .....................................................226
8.7.20 Register block RB 160 parameters for communication .............................................................231
8.7.21 Register block RB 162 device configuration..............................................................................232
8.7.22 Register block RB 165 identification comment ..........................................................................233
8.8 SENTRON 3VL data areas........................................................................................................234
8.8.1 Cyclic data..................................................................................................................................234
8.8.2 Protection settings .....................................................................................................................237
8.8.3 Diagnostics/counters..................................................................................................................239
8.8.4 Configuration..............................................................................................................................240
8.8.5 Trip log .......................................................................................................................................240
8.8.6 Commands.................................................................................................................................241
8.8.7 Settings and status of the communication module ....................................................................242
8.8.8 Description of the communication module.................................................................................242
8.8.9 ETU identification.......................................................................................................................243
8.8.10 Identification of the communication module...............................................................................243
8.9 Formats......................................................................................................................................243
8.9.1 Formats of the data points .........................................................................................................243
8.9.2 General data formats .................................................................................................................244
8.9.3 Special data formats ..................................................................................................................246
8.9.4 Data formats 15 to 24 ................................................................................................................247
8.9.5 Data formats 88 to 162 ..............................................................................................................252
8.9.6 Data formats 307 to 373 ............................................................................................................260
8.9.7 Data formats 401 to 426 ............................................................................................................263
A List of abbreviations............................................................................................................................... 267
A.1 List of abbreviations ...................................................................................................................267
Glossary ................................................................................................................................................ 269
Index...................................................................................................................................................... 273
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3WL/3VL circuit breakers with communication capability - Modbus
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3WL/3VL circuit breakers with communication capability - Modbus
System Manual, 07/2011, A5E02126891-02 9
Introduction and overview 1
1.1 General information
1.1.1 Structure of the manual
Purpose of the manual
This manual describes the diverse application options of circuit breakers with communication
capability in power distribution.
1.1.2 Introduction
In industrial automation, the demand for communication capability, data transparency and
flexibility is growing constantly. To enable industrial switchgear technology to meet this
demand, the use of bus systems and intelligent switching devices is unavoidable since
industrial production and building management are now inconceivable without
communication technology.
The demands on the electrical and mechanical properties of circuit breakers, their
adaptability and cost-effectiveness have contributed to the unexpectedly far-reaching
development of circuit breakers in recent years. Progress in rationalization and automation
has accelerated this process.
Introduction and overview
1.1 General information
3WL/3VL circuit breakers with communication capability - Modbus
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1.1.3 SENTRON circuit breakers
SENTRON is a range of circuit breakers with communication capability comprising two
models:
● SENTRON WL: air circuit breaker
● SENTRON VL: compact circuit breaker
In power distribution systems they can transfer important information via bus systems to a
central control room for the purpose of:
● Instantaneous values
● Energy values
● Demand values
● Min / Max
● Diagnostics management
● Fault management
● Maintenance management
● Cost center management
Utilization of the resulting possibilities turns a circuit breaker into something more than just a
switching and protection device. Only when the automation and low-voltage switchgear and
controlgear used can be fully integrated into a communication solution in a user-friendly and
fully functional way, can the following functions be implemented:
● Integrated communication
● Data acquisition
● Forwarding
● Evaluation
● Visualization of data
Data acquisition and evaluation
Status information, alarm messages, trigger information, and threshold violations (e.g.
overcurrent, phase unbalance, overvoltage) are acquired and forwarded. Transparency in
power distribution enables a fast response to such statuses. Important messages can be
transmitted to the cell phones of the maintenance personnel as text messages by means of
additional modules (e.g. WinCC and Funkserver Pro). Timely evaluation of this data enables
selective intervention in the process and prevents plant failures.
Introduction and overview
1.1 General information
3WL/3VL circuit breakers with communication capability - Modbus
System Manual, 07/2011, A5E02126891-02 11
Maintenance
Information for preventive maintenance (e.g. number of switching cycles or operating hours)
enables timely planning of personnel and material. This increases the level of plant
availability. Destruction of sensitive system components due to failures is prevented.
Communication helps to provide specific information about the location and cause of power
failures. Recording of phase currents allows precise determination of the cause of the fault
(e.g. triggered by short circuit of 2317 A in phase L2 on 27.08.2007 at 14:27). This is the
basis for fast correction of the fault and creates a significant potential for cost savings.
Statistics and cost-effectiveness
Recording of power, energy and the power factor cos φ opens up further possibilities.
Energy profiles can be created and the costs can be clearly allocated thanks to the
transparent representation of energy consumption for business administration analysis.
Energy costs can later be optimized by compensating for load peaks and troughs.
Modular and intelligent
The SENTRON circuit breaker program consists of a small number of components with a
host of combination options, and it encompasses a performance range from 16 A to 6300 A.
The versatility in power distribution achieved by this modularity enables low-cost, flexible
integration of the SENTRON circuit breakers into higher-level system solutions using
communication.
Saving costs
The benefits of the SENTRON circuit breakers result both from their modular design and
compact construction. This saves costs for work processes in planning and trade, and for
switchgear manufacturers and plant operators. It also saves space and energy.
Easy planning
This results from the use of the SENTRON circuit breakers and the SIMARIS deSign
planning tool, which enables the solution of previously tedious and difficult processes,
primarily for planning offices but also for control cabinet builders.
System solutions
Embedding of the SENTRON circuit breakers into a higher-level communication system
makes it possible to parameterize the circuit breakers via Modbus RTU, PROFIBUS DP,
Ethernet or the Internet, or to optimize the entire power distribution system by means of an
integrated power management system (e.g. powermanager).
Introduction and overview
1.2 Bus systems
3WL/3VL circuit breakers with communication capability - Modbus
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1.2 Bus systems
Bus systems are used to connect distributed devices with various levels of intelligence. Bus
systems differ in their topologies and mechanisms, with some designed for quite specific
application cases, and others aimed more at open applications.
Bus systems in automation
The most important bus systems in the areas of automation and power distribution are
described below:
● PROFIBUS DP
● Ethernet
● Modbus RTU
1.2.1 Modbus RTU
Definition/standard
Modbus RTU is an open, serial communication protocol based on the master-slave
architecture. It can be implemented extremely easily on any serial interfaces. Modbus RTU
comprises one master and several slaves, with communication controlled exclusively by the
master.
Communication
Modbus RTU has two fundamental communication mechanisms:
● Query/response (Polling): The master sends a request frame to any station and expects a
response frame.
● Broadcast: The master sends a command to all stations on the network. These execute
the command without acknowledgment.
Message frames
The message frames allow process data (input/output data) to be written or read either
individually or in groups.
Modbus RTU is used on different transmission media. Implementation on the RS485
physical bus, a shielded, twisted-pair cable with terminating resistors, is widespread.
Introduction and overview
1.2 Bus systems
3WL/3VL circuit breakers with communication capability - Modbus
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Applications
The Modbus RTU protocol is used for:
● Networking of controllers
● Linking input/output modules
Use of Modbus RTU is recommended above all for applications with:
● Low time requirements
1.2.2 Ethernet
Definition/standard
Industrial Ethernet is a powerful cell network in accordance with the IEE 802.3 (ETHERNET)
standard. Transfer rates up to 1 Gbit/s in conjunction with "Switching Full Duplex" and
"Autosensing" make it possible to adapt the required power in the system to the prevailing
requirements. The data rate can be selected to suit particular needs, as integrated
compatibility makes it possible to introduce the technology in stages. With a current market
share of over 80%, Ethernet is the most frequently used LAN in the world.
The benefits of Ethernet are as follows:
● Ethernet is especially suitable for harsh industrial environments subject to
electromagnetic interference.
● With the new technology of the Internet, Ethernet offers diverse options for global
networking.
● With Industrial Ethernet, SIMATIC NET ® offers the means of using intranets, extranets
and the Internet - already available in the office area - in EMI-polluted production
processes and process automation.
Communication between peers
Ethernet is not designed on the master-slave principle like PROFIBUS DP or Modbus RTU.
All nodes are equal peers on the bus and each can transmit and/or receive.
A sender can only start transmitting on the bus if no other node is transmitting at that
moment. This is implemented by having each node "listen in" to determine if message
frames are addressed to it or if there is currently no active sender. If a sender has started
transmitting, the transmitted frame is checked for corruption. If the frame is not modified,
transmission is continued.
If the sender detects corruption in its data, another sender must have started before it, and
both nodes terminate transmission. The sender restarts transmission again after a random
time.
This access procedure is called CSMA/CD. This "random" access procedure cannot
guarantee that a reply is sent within a specific time period. That depends heavily on the bus
traffic load. For this reason, it is not possible to implement real-time applications with
Ethernet.
Introduction and overview
1.2 Bus systems
3WL/3VL circuit breakers with communication capability - Modbus
14 System Manual, 07/2011, A5E02126891-02
Data transfer
There are several methods of transferring the data of the SENTRON circuit breakers on
PROFIBUS DP or Modbus RTU to Ethernet. These are represented here by two solutions
using SIEMENS components:
Solution 1 A SIMATIC S7 controller is equipped with a PROFIBUS DP or
Modbus RTU interface (CPU-internal interface or modules with
communications processors) and an Ethernet interface. The data
transferred by the circuit breakers over PROFIBUS DP or Modbus RTU is
"re-sorted" in the SIMATIC and communicated via Ethernet. The
CP 343-1, CP 343-1 IT, CP 343-1 PN, CP 443-1 and CP 443-1 IT are
available as possible Ethernet communications processors for the S7.
Solution 2 As an autonomous component, the IE/PB link forms the seamless
transition between Industrial Ethernet and PROFIBUS DP.
Solution 3 A 7KM PAC4200 Power Monitoring Device as a gateway (see the Chapter
Gateway in TCP / IP networks (Page 145))
Ordering information
Ordering information and further gateway options can be found in the Catalog "Industrial
Communication" (IK PI) Chapter 8.
1.2.3 PROFIBUS DP
Definition/standard
PROFIBUS DP is an open, standardized and multi-vendor fieldbus system. It is standardized
in compliance with IEC 61158/EN 50170 and is thus the ideal basis for the high data
exchange requirements in the area of distributed I/O and field devices. To-date (July 2007),
more than 1,100 manufacturers offer in excess of 1,700 products and the user organizations
in 23 countries support the users of more than 4 million installed PROFIBUS nodes.
Integration into automation systems
Integration and linking to current concepts in automation is similarly unproblematic since all
the large manufacturers offer PROFIBUS DP master modules for programmable logic
controllers (PLCs). And with high data transfer rates of up to 12 MBaud/s, the systems
operate almost in real time.
Master-master communication
The protocol used for PROFIBUS DP node communication ensures communication between
the complex automation devices with equal priority (masters). Each node completes its
communication tasks within a fixed time frame.
Introduction and overview
1.2 Bus systems
3WL/3VL circuit breakers with communication capability - Modbus
System Manual, 07/2011, A5E02126891-02 15
Master-slave communication (token-passing procedure)
Furthermore, simple cyclic data exchange is used for communication between a master and
the simple I/O devices (slaves) assigned to it. PROFIBUS DP uses a hybrid bus access
control for this comprising a central token-passing procedure between the active bus nodes
(masters) and a central master-slave procedure for data exchange between the active and
passive bus nodes.
System configuration
The following system configurations can be implemented with this bus access control:
● Pure master-slave system
● Pure master-master system with token passing
● A combination of both systems
The following figure shows communication on PROFIBUS:
● Token passing between the available masters
● Polling between master and slave nodes
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Figure 1-1 Communication on PROFIBUS
The figure above shows an example with three master modules and seven slaves. The three
master devices form a logical ring. The token is controlled by the MAC (media access
control). It generates the token in the startup phase and checks if actually only one token
circulates in the logical ring.
Introduction and overview
1.2 Bus systems
3WL/3VL circuit breakers with communication capability - Modbus
16 System Manual, 07/2011, A5E02126891-02
Master classes
Each slave that communicates cyclically via PROFIBUS DP is assigned to a class 1 master.
Cyclic data traffic takes place in accordance with the DP standard profile (DPV0).
Master class 1 A class 1 master is used primarily for performing automation tasks. In
addition to cyclic data exchange, a class 1 master can also establish an
acyclic communication connection with its slaves and thus make use of the
expanded functions of a slave.
Master class 2 A class 2 master is especially suitable for commissioning, diagnostics and
visualization tasks. It is connected to PROFIBUS DP in addition to the class
1 master and can access slaves via acyclic services and exchange data,
provided the slaves permit it.
Acyclic data transfer
Acyclic data transfer is implemented via DPV1. DPV1/DPV2 adds several functions to the
existing PROFIBUS standard for this purpose. These include reparameterization of the slave
configuration during operation, and the establishment of acyclic data traffic. With the help of
DPV1, data can also be read direct from the slave by a class 2 master, even though it still
has a logical link to a class 1 master. In physical terms, DPV1 transfer and DP standard
transfer take place over one line.
Acyclic data transfer is used, for example, in conjunction with operator control and
monitoring systems such as WinCC or configuration software like Switch ES Power. The PC
used here with built-in PROFIBUS DP interface card then handles the function as a class 2
master. From there, the data sets are transferred via DPV1 and the new values are set, e.g.
in the case of changing the value for the tripping current. However, cyclic data exchange
between the circuit breaker and the PLC continues.
Introduction and overview
1.2 Bus systems
3WL/3VL circuit breakers with communication capability - Modbus
System Manual, 07/2011, A5E02126891-02 17
1.2.4 Communication structure of the SENTRON circuit breakers
The figure below provides an overview of the communication options of the SENTRON
circuit breakers and their modules.
Modbus RTU
5
1
19
20
17
2
18
12 13 14 15 16 6
7
1
3
8
9
10
11
4
20
Modbus RTU
Ethernet
CubicleBUS
① 3VL molded-case circuit breaker ⑪ Metering function PLUS
② Electronic trip unit LCD ETU ⑫ ZSI module
③ Electronic trip unit ETU ⑬ Digital output module with relay contacts
④ COM21 Modbus RTU from Release 2 - including ZSI ⑭ Digital output module with relay contacts,
configurable
⑤ COM21 Modbus RTU - including ZSI ⑮ Analog output module
⑥ BDA PLUS with Ethernet interface ⑯ Digital input module
⑦ 3WL air circuit breaker ⑰ Software tool, e.g.
powerconfig
from V2.2 on PC
⑧ COM16 Modbus RTU ⑱ PLC, e.g. SIMATIC S7
⑨ Breaker Status Sensor (BSS) ⑲ HMI, e.g.
powermanager
⑩ Electronic trip unit ETU ⑳ 7KM PAC Power Monitoring Devices
Figure 1-2 System architecture of the SENTRON circuit breakers - Modbus RTU
Introduction and overview
1.2 Bus systems
3WL/3VL circuit breakers with communication capability - Modbus
18 System Manual, 07/2011, A5E02126891-02
3WL/3VL circuit breakers with communication capability - Modbus
System Manual, 07/2011, A5E02126891-02 19
General information 2
2.1 Other system manuals and literature
Sources of information and other documentation
The following manuals supplement the present manual:
Operating Instructions of the SENTRON WL circuit breaker 3ZX1812-0WL00-0AN1
System manual for the SENTRON VL circuit breaker 3ZX1012-0VL10-0AB1
System manual for 3WL/3VL circuit breakers with communication capability -
PROFIBUS
A5E01051347-02
2.2 Approvals
The SENTRON product range complies with the following directives:
●Low Voltage Directive 2006/95/EC
●EMC Directive 2004/108/EC
●Underwriters Laboratories, Inc.: UL 508 registered (Industrial Control Equipment)
●Canadian Standards Association: CSA C22.2 Number 142, tested (Process Control
Equipment)
2.3 Standards and approvals
The SENTRON series is based on the IEC 60947-2 standard. PROFIBUS DP meets all the
requirements and criteria of IEC 61131, Part 2, and the requirements for CE marking.
3VL/3WL have CSA and UL approvals.
The SENTRON VL/WL circuit breakers comply with the standards:
● IEC 60947-1, EN 60947-1
● DIN VDE 0660, Part 100
● IEC 60947-2, EN 60947-2
● DIN VDE 0660, Part 101
● Isolating features in accordance with IEC 60947-2, EN 60947-2
General information
2.4 Orientation aids
3WL/3VL circuit breakers with communication capability - Modbus
20 System Manual, 07/2011, A5E02126891-02
2.4 Orientation aids
The manual contains various features supporting quick access to specific information:
● At the beginning of the manual you will find a table of contents.
● The chapters contain subheadings that provide an overview of the content of the section.
● Following the appendices, a glossary defines important technical terms used in the
manual.
● Finally, a comprehensive index allows quick access to information on specific subjects.
2.5 Up-to-the-minute information at all times
Your regional contact for low-voltage switchgear with communication capability will be happy
to help you with any queries you have regarding the SENTRON series. A list of contacts and
the latest version of the manual are available on the Internet at:
SENTRON (http://www.siemens.com/sentron)
2.6 Scope
This manual applies to circuit breakers with the following designations:
SENTRON
● VL160 to VL1600
● VL150 UL to VL1600 UL
● 3WL1, 3WL2, 3WL3 and 3WL5
Disclaimer of liability
The products described here were developed to perform safety-oriented functions as part of
an overall installation or machine. A complete safety-oriented system generally features
sensors, evaluation units, signaling units, and reliable shutdown concepts. It is the
responsibility of the manufacturer to ensure that a system or machine is functioning properly
as a whole. Siemens AG, its regional offices, and associated companies (hereinafter referred
to as "Siemens") cannot guarantee all the properties of a whole plant or machine that has
not been designed by Siemens.
Nor can Siemens assume liability for recommendations that appear or are implied in the
following description. No new guarantee, warranty, or liability claims beyond the scope of the
Siemens general terms of supply are to be derived or inferred from the following description.
Up-to-the-minute information
You can find further assistance on the
Internet at: Technical support (http://www.siemens.com/lowvoltage/technical-support)
3WL/3VL circuit breakers with communication capability - Modbus
System Manual, 07/2011, A5E02126891-02 21
SENTRON WL 3
3.1 Introduction and overview
3.1.1 The CubicleBUS
Within the integrated and modular architecture of the SENTRON WL, the CubicleBUS
connects all intelligent components within the SENTRON WL and enables simple and safe
connection of other external additional components. The CubicleBUS is already prepared in
all complete circuit breakers with the trip units ETU45B / ETU745 / ETU748 and ETU76B /
ETU776 (CubicleBUS integrated).
Retrofitting components
The high modularity of the system allows retrofitting of communication functions (e.g.
metering function) at any time. Retrofitting of a SENTRON WL that does not yet have
communication capability is also possible on-site in the plant. All modules on the
CubicleBUS can access the available source data of the circuit breaker direct and thus
ensure extremely high-speed access to information.
In addition, the connection of external add-on modules to CubicleBUS allows low-cost
solutions for connecting further communication-capable devices in the switching station.
3.1.2 Communications capability of electronic trip units (ETU)
The electronic trip units ETU45B / ETU745 / ETU748 and ETU76B / ETU776 are all capable
of communication. The CubicleBUS is brought out at the terminals X8:1 to X8:4 in the circuit
breaker.
Versions
The communication-capable trip units differ in their design:
● The ETU45B / ETU745 / ETU748 has a rotary coding switch on the front for setting the
protection parameters. These can only be read via the communication system.
● Optionally, the ETU45B / ETU745 / ETU748 can be equipped with a four-line display for
showing the measured values.
● The ETU76B / ETU776 offers a pixel-graphics display with a clear, key-operated menu.
This display can be used not only to show measured values, status information and
maintenance information, but also to read all available parameters and modify them with
password protection.
SENTRON WL
3.1 Introduction and overview
3WL/3VL circuit breakers with communication capability - Modbus
22 System Manual, 07/2011, A5E02126891-02
Tripping system
The table below provides an overview of the functions and options of the communication-
capable trip units ETU45B / ETU745 / ETU748 and ETU76B / ETU776.
3.1.3 Function overview of the overcurrent tripping system
Table 3- 1 Function overview of the tripping system of the IEC ETUs
Basic function ETU45B ETU76B
Overload protection ✓ ✓
Function can be switched on/off – ✓
Adjustment range IR = In × ... 0.4_0,45_0,5_0,55_0.6
0.65_0,7_0,8_0,9_1
0.4...1
Switchable overload protection
(I2t or I4t-dependent function)
✓ ✓
Adjustment range time-lag class tR
at 6 × IR for I2t
2_3.5_5.5_8_10_14_1_21_2530 s 2...30 s
Adjustment range time-lag class tR
at 6 × IR for I4t
1-2-3-4-5 s 1...5 s
Thermal memory can be switched on/off ✓ ✓
Phase loss sensitivity at tsd = 20 ms (M) ✓ (on/off)
N-conductor protection ✓ ✓
Function can be switched on/off ✓ ✓
N-conductor adjustment range
IN = In × ...
0.5...1 0.2...2
Short-time delayed short-circuit
protection
✓ ✓
Function can be switched on/off ✓ ✓
Adjustment range Isd = In × ... 1.25_1,5_2_2,5_3_4_6_8_10_12 1.25 x In...0.8 x Icw
Adjustment range delay time tsd M-100-200-300-400 ms M-80...4000 ms
Switchable short-time delayed short-
circuit protection (I2t-dependent function)
✓ ✓
Adjustment range delay time tsd
at I2t
100-200-300-400 ms 100...400 ms
ZSI function Via CubicleBUS module Via CubicleBUS module
Instantaneous short-circuit protection ✓ ✓
Function can be switched on/off ✓ ✓
Adjustment range Ii = In × ... 1.5_2.2_3_4_6_8_10_12 x Ics 1.5 x In...0.8 x Ics
Ground-fault protection Retrofittable module Retrofittable module
Tripping and alarm functions ✓ ✓
Tripping function can be switched on/off ✓ ✓
,1
16(D
Alarm function can be switched on/off – ✓
SENTRON WL
3.1 Introduction and overview
3WL/3VL circuit breakers with communication capability - Modbus
System Manual, 07/2011, A5E02126891-02 23
Basic function ETU45B ETU76B
Recording of the ground-fault current via
summation current conversion with
internal or external N-conductor
transformer
✓ ✓
Recording of the ground-fault current via
external transformer
✓ ✓
Adjustment range of the response
current Ig for tripping
A-B-C-D-E A...E*
Adjustment range of the response
current Ig for alarm
A-B-C-D-E A...E*
Adjustment range of the delay time tg 100-200-300-400-500 ms 100...500 ms
Switchable ground-fault protection
(I2t-dependent function)
✓ ✓
Adjustment range delay time tg
at I2t
100-200-300-400-500 ms 100...500 ms
ZSI-G function Via CubicleBUS module Via CubicleBUS module
Switchable – ✓
LCD alphanumeric (4-line) Optional –
LCD graphical – ✓
CubicleBUS integrated ✓ ✓
Communication capability ✓ ✓
NSE00889
Metering function capability with
metering function PLUS
✓ ✓
Overcurrent release active ✓ ✓
Alarm ✓ ✓
ETU fault ✓ ✓
L tripping operation ✓ ✓
S tripping operation ✓ ✓
I tripping operation ✓ ✓
N tripping operation ✓ ✓
G tripping operation ✓ (only with ground-fault
protection module)
✓ (only with ground-fault
protection module)
G alarm ✓ (only with ground-fault
protection module)
✓ (only with ground-fault
protection module)
Tripping operation as a result of
extended protection function
✓ ✓
NSE00890
Communication ✓ ✓
SENTRON WL
3.1 Introduction and overview
3WL/3VL circuit breakers with communication capability - Modbus
24 System Manual, 07/2011, A5E02126891-02
Basic function ETU45B ETU76B
Load pick up ✓ ✓
Load shedding ✓ ✓
Leading signal overload trip 200 ms ✓ ✓
Temperature alarm ✓ ✓
Phase unbalance ✓ ✓
Instantaneous short-circuit trip ✓ ✓
Short-time delayed short-circuit trip ✓ ✓
Overload trip ✓ ✓
Neutral conductor trip ✓ ✓
Ground-fault protection trip ✓ (only with ground-fault
protection module)
✓ (only with ground-fault
protection module)
Ground-fault alarm ✓ (only with ground-fault
protection module)
✓ (only with ground-fault
protection module)
Auxiliary relay ✓ ✓
NSE00891
ETU fault ✓ ✓
* Set values for Ig
Size I/II
A 100 A
B 300 A
C 600 A
D 900 A
E 1200 A
Size III
A 400 A
B 600 A
C 800 A
D 1000 A
E 1200 A
SENTRON WL
3.1 Introduction and overview
3WL/3VL circuit breakers with communication capability - Modbus
System Manual, 07/2011, A5E02126891-02 25
Table 3- 2 Function overview of the tripping system of the UL-ETUs
Basic function ETU745 / ETU748 ETU776
Overload protection ✓ ✓
Function can be switched on/off – –
Adjustment range IR = In × ... 0.4_0,45_0,5_0,55_0,6-0.65_
0,7_0,8_0,9_1
0.4...1 (increment: 1A)
Switchable overload protection
(I2t or I4t-dependent function)
✓ ✓
Adjustment range time-lag class tR
at 6 × IR for I2t
2_3,5_5,5_8_10_
14_17_21_25_30
2_..._30 (increment:
0.1s)
Adjustment range time-lag class tR
at 6 × IR for I4t
1_2_3_4_5 1_..._5 (increment: 0.1s)
Thermal memory can be switched
on/off
✓ (via slide switch) ✓ (via keypad or
communication)
Phase loss sensitivity at tsd = 20 ms (M) ✓ (via keypad or
communication)
N-conductor protection ✓ ✓
Function can be switched on/off ✓ (via slide switch) ✓ (via slide switch)
N-conductor adjustment range
IN = In × ...
0.5...1 0.5...1
Short-time delayed short-circuit
protection
✓ ✓
Function can be switched on/off ✓ (via rotary switch) ✓ (via keypad or
communication)
Adjustment range Isd = In × ... 1.25_1,5_2_2,5_3_4_6_8_10_12 1.25_..._0.8 x Icw = max.
(increment: 10 A)
Adjustment range delay time tsd
at I2d (s)
0.02
(M)_0.1_0.2_
0.3_0.4_OFF
0.02
(M)_0.1_0.2_0.3_0.4
M_0.08_..._0.4_OFF
(increment: 0.001s)
Switchable short-time delayed short-
circuit protection
(I2t-dependent function)
✓ (via rotary switch) ✓ (via keypad or
communication)
Adjustment range delay time tsd
at I2t
0.1_0,2_0,3_0.4 0.1_..._0,4
(increment: 0.001s)
ZSI function Via CubicleBUS module Via CubicleBUS module
Instantaneous short-circuit protection ✓ — ✓
Function can be switched on/off ✓ (via rotary
switch)
— ✓ (via keypad or
communication)
Adjustment range Ii = In × ... 1.5_2,2_3_4_6
_8_10_12
0.8 x Icw =
max.,
OFF = Icw
— 1.5 x In...0.8 x Ics = max.,
OFF = Icw
Ground-fault protection2 Retrofittable module Retrofittable module
Tripping and alarm functions ✓ ✓
Tripping function can be switched
on/off
,1
16(D
Alarm function can be switched on/off
SENTRON WL
3.1 Introduction and overview
3WL/3VL circuit breakers with communication capability - Modbus
26 System Manual, 07/2011, A5E02126891-02
Basic function ETU745 / ETU748 ETU776
Recording of the ground-fault current
via summation current conversion
with internal or external N-conductor
transformer
✓ ✓
Recording of the ground-fault current
via external transformer
Adjustment range of the response
current Ig for tripping
A-B-C-D-E A...E (increment: 1 A)
Adjustment range of the response
current Ig for alarm
A-B-C-D-E A...E (increment: 1 A
Adjustment range of the delay time tg 100-200-300-400-500 ms 100...500 ms
(increment: 0.001s)
Switchable ground-fault protection
(I2t-dependent function)
✓ ✓
Adjustment range delay time tg
at I2t
100-200-300-400-500 ms 100...500 ms
(increment: 0.001s)
ZSI-G function Via CubicleBUS module Via CubicleBUS module
Switchable – ✓
LCD alphanumeric (4-line) Optional –
LCD graphical – ✓
CubicleBUS integrated ✓ ✓
Communication capability ✓ ✓
NSE00889
Metering function capability with
metering function PLUS
✓ ✓
Overcurrent release active ✓ ✓
Alarm ✓ ✓
ETU fault ✓ ✓
L tripping operation ✓ ✓
S tripping operation ✓ ✓
I tripping operation ✓ ✓
N tripping operation ✓ ✓
G tripping operation ✓ (only with ground-fault protection
module)
✓ (only with ground-fault
protection module)
G alarm ✓ (only with ground-fault protection
module)
✓ (only with ground-fault
protection module)
Tripping operation as a result of
extended protection function
✓ ✓
NSE00890
Communication ✓ ✓
SENTRON WL
3.1 Introduction and overview
3WL/3VL circuit breakers with communication capability - Modbus
System Manual, 07/2011, A5E02126891-02 27
Basic function ETU745 / ETU748 ETU776
Load pick up ✓ ✓
Load shedding ✓ ✓
Leading signal overload trip 200 ms ✓ ✓
Temperature alarm ✓ ✓
Phase unbalance ✓ ✓
Instantaneous short-circuit trip ✓ ✓
Short-time delayed short-circuit trip ✓ ✓
Overload trip ✓ ✓
Neutral conductor trip ✓ ✓
Ground-fault protection trip ✓ (only with ground-fault protection
module)
✓ (only with ground-fault
protection module)
Ground-fault alarm ✓ (only with ground-fault protection
module)
✓ (only with ground-fault
protection module)
Auxiliary relay ✓ ✓
NSE00891
ETU fault ✓ ✓
1 With the setting Ii = Off = IEP the circuit breaker can be used even at the maximum short-circuit breaking capacity and
above.
2 Once it has been installed, the ground-fault protection module cannot be uninstalled.
3.1.4 Availability of the data on the CubicleBUS
Data library
Each data point from the data library of the SENTRON circuit breakers can only be
generated by a single module, the data source. If this data source (node) is available, the
data points assigned to the data source will also be available.
This availability is described and also communicated in the "property bytes". If a data source
(node) is not available, the data point will also not exist. This can also be seen in the
associated property byte. Chapter Data library (Page 157) provides a precise description of
the individual data points.