Siemens Cubicle Bus Manual and ETU776 Trip Unit Comprehensive Guide
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Communication-capable Circuit Breakers

The MODBUS COM16 Module and the BSS

WL Circuit Breaker

The COM16 module enables the WL Circuit Breaker to exchange data via MODBUS to supervisory systems and MODBUS masters. The COM16 module retrieves some of the key data on the status of the circuit breaker (circuit breaker open/closed, closing spring charged, ready-to- close, etc.) via the CubicleBUS from the BSS (breaker status sensor). Both modules are, therefore, offered together as

a MODBUS communication package.

MODBUS Module COM16

The COM16 module for the WL enables the circuit breaker to be connected to any MODBUS master network. This makes it easy to add WL and a COM16 to existing MODBUS networks.

If required, control/write access to the circuit breaker can be locked using hardware and software to prevent any switching operations

taking place via MODBUS (manual or automatic operation) or parameters from being changed.

All key events are assigned a time stamp from the integrated clock to enable operators to keep track of alarms. This device clock can be synchronized with the clock in the automation system.

A temperature sensor integrated in the COM16 module measures the temperature surrounding the breaker in the switchgear cubicle.

Three integrated microswitches located in the COM16 module are used to detect the position of the circuit breaker (connect, test, disconnect and not present) and communicate via MODBUS. The circuit breaker can be remotely operated only in the test or connect position.

Pin Configuration

The COM16 module is connected to the auxiliary conductor plug-in system at X7.

The electrical connections to the circuit breaker and the CubicleBUS connection to the internal CubicleBUS modules (ETU, BSS, metering function, etc.) are defined in Section 9 of the Operator's Manual and the individual instruction sheets.

Interposing relays must be used if the opening and closing solenoids are designed for voltages other than 24V DC.

Terminals X9.1 and X9.2 must be used if the second shunt trip rather than the first shunt trip is used to open the circuit breaker via communication.

The unassigned user output can be used as required and must be connected in the same way as a coupling device (see Graphic 2-4). It can be used, for example, to reset the trip indicator if the remote reset option has been installed. As with Open and Close, only voltages of up to 24V DC are permitted (note the polarity); coupling devices must be used for higher voltages.

The communications line is connected to the 9-pin interface on the front of the COM16 module. The CubicleBUS connection for a RJ45 plug is located at the rear and is used to connect the external CubicleBUS modules. If no external CubicleBUS module is connected, the terminating resistor supplied must be used as an RJ45 plug.

The unassigned user input can be connected using a contact element with the 24V DC from pin 1 to transmit the status of the contact element.

Graphic 2-2The text on the COM16 module shows the external pin configuration for connecting the closing solenoid and the shunt trips, as well as the MODBUS write protection function and the unassigned input/output.

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WL MODBUS Communication and Electronic Accessories • January 2005

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Contents Global network of innovation Powerful ideasCommunication-capable Circuit Breakers Communication-capable Circuit Breaker Registered Trademarks Safety GuidelinesQualified Personnel Correct UsageIntroduction Overview General Content of the ManualIntroduction Easy Planning System SolutionsWL Circuit Breakers-Modular Intelligent Cost SavingModbus Communication Bus SystemsCommunication Structure of the WL Circuit Breakers Ethernet WL Circuit Breaker Brief Description of the WL Circuit Breaker Introduction and OverviewCommunications Capability of the Electronic Trip Units ETUs CubicleBUSETU725 ETU727 ETU745 Functional overview of the trip unit systemBasic Functions ETU725 ETU727 ETU745 Setting range of the Ig Basic Functions ETU748 ETU755 ETU776 Communication Data points with the same source 755 or Data Availability on the CubicleBUSData point group ETU745 MeteringModbus COM16 Module and the BSS Pin ConfigurationModbus Module COM16 Modbus Installation Guideline Modbus Write Protection DPWriteEnableMeaning Position and text on the cable CubicleBUS Data Exchange via the COM16 ModuleCubicleBUS + Position Rear Microswitch S46 Middle S47 Front S48Meaning Cubicle BUS LED MeaningBreaker Status Sensor BSS General Metering Function PlusHarmonic analysis Metering Function PlusWaveform buffer Maximum distance from voltage transformer Parameters for the settings of the metering functionVoltage Transformers VT AccuracyMetering range 81THDC Load Management Important functions/parameters for communicationsExtended Protective Function Event and Trip Log Normal Positive Power Flow DirectionSetpoints Minimum for Communicated CurrentsInstallation Rotary SwitchesExternal CubicleBUS Modules Maximum CubicleBUS Configuration Power SupplyCubicleBUS Installation Guidelines All other LEDs Meaning LED DisplayMeaning CubicleBUS LED MeaningDevice Testing the Digital Input and Output ModulesFunctional description for changing parameter sets Technical data for the digital input moduleDigital Input Module Functional descriptionDelay time Digital Output Module with Rotary SwitchSelector switch position to the left Selector switch position to the rightConfigurable Digital Output Module Trigger event Waveform buffer B Technical data for the digital configurable output moduleAnalog Output Module Power value ranges W/VATechnical data for the analog output module Switch position cosTest function Operating principle ZSI ModuleExample as illustrated in Graphic It trips after tZSI = 50 ms. Time saved = 250 ms Technical data for the ZSI moduleCommunication-capable Circuit Breakers General information Output current Inrush current Type Order No Communication-capable Circuit Breakers Modbus Profile for WL Circuit Breaker Supervisory Systems Function 01 Read Coils COM16 Supported Function CodesFunction 02 Read Discrete Inputs Request Message to slave Function 03 Read Holding RegistersReply Message from slave Function 05 Write Single Coil Function 04 Read Input RegistersFunction 07 Read Exception Status Function 11 Get Communication Event Counter Function 08 DiagnosticsFunction 12 Get Communication Event Log COM16 slave Send Event What the Event Bytes ContainFunction 15 Write Multiple Coils Function 16 Write Multiple Registers Exception Responses Code Name Meaning Exception CodesBasic Data Type 1 Registers and Default Data Points Default Register ListsBasic Data Type 2 Registers and Default Data Points Basic Data Type 3 Registers and Default Data Points Data bytes Complete List of DatasetsMin Max Bits Sample DatasetByte Register Description Bit Mapping for Breaker Status RegisterWL Configurator Brief Description Communication-capable Circuit Breakers Breaker Data Adapter BDA Breaker Data Adapter Plus BDA Plus Description Brief Description and System RequirementsBenefits of the BDA BDA as a Hand-Held Device or BDA Plus BDA in Offline Mode or BDA PlusIntranet and Internet BDA Plus as an Ethernet InterfaceCircuit breaker requirements What is Java?Getting started with the BDA Plus Temporary Connection to WL Circuit BreakersPermanent Meaning of the LEDs on the BDA Operation4This table provides technical data for the BDA and BDA Plus Technical data for the BDA and BDA PlusUsually have to be changed. They are shown as a reference Connection to the BDA via the Serial Communication SystemBreaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Breaker Data Adapter BDA Definition of Key Terms Connection to the BDA Plus via the Ethernet InterfaceBDA IP Address IP AddressesSubnet Mask ExampleDisplaying Data Operating Instructions and TroubleshootingOffline/Online Mode Languages and HelpPrinting Password ProtectionSentron Operation ExampleTroubleshooting List Fault Description Solution Siemens Energy & Automation, Inc. All Rights Reserved Siemens Energy & Automation, Inc
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