Siemens UL1066, UL 489 specifications Function 03 Read Holding Registers, Request Message to slave

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Communication-capable Circuit Breakers

WL Circuit Breaker

Function 03: Read Holding Registers

Function	This function reads a set of registers from a COM16 slave.

Start Address	Any value within the address range defined for each of the data sets. If any other address is specified,
	an Exception Code of 02 (Invalid Data Address) will be returned.

Quantity of Registers	If “Quantity of Registers” is not in the range of 1 to 125, an Exception Code of 03 (Invalid Data Value)
	will be returned. If the “Quantity of Registers” is not correct for the Dataset indicated by the “Start
	Address”, an Exception Code of 02 (Invalid Data Address) will be returned.

Example:

Request Message to slave

The following is an example of a request to read Dataset 0 from a COM16 slave device at

MODBUS address 7. The length of Dataset 0 is 4 bytes.

07H	Slave Address
03H	Function Code
00H	Register Start Address "High" (Dataset 0 address is 0000 hex)
b7H	Register Start Address "Low"
00H	Quantity of Registers "High" (Register quantity is 4 decimal)
04H	Quantity of Registers "Low"
xxH	CRC Check Code "Low"
xxH	CRC Check Code "High"

Reply Message from slave

The response returns 2 registers containing the contents of Dataset 0.

07H	Slave Address
03H	Function Code
04H	Byte Count (Bytes returned is 4)
00H	Register Address 00H Data "High"
03H	Register Address 00H Data "Low"
00H	Register Address 00H	Data "High"
00H	Register Address 01H	Data "Low"
xxH	CRC Check Code "Low"
xxH	CRC Check Code "High"

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WL MODBUS Communication and Electronic Accessories • January 2005

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Contents Powerful ideas Global network of innovationCommunication-capable Circuit Breakers Communication-capable Circuit Breaker Correct Usage Safety GuidelinesQualified Personnel Registered TrademarksIntroduction Overview Introduction Content of the ManualGeneral Cost Saving System SolutionsWL Circuit Breakers-Modular Intelligent Easy PlanningCommunication Bus Systems ModbusCommunication Structure of the WL Circuit Breakers Ethernet WL Circuit Breaker Introduction and Overview Brief Description of the WL Circuit BreakerCubicleBUS Communications Capability of the Electronic Trip Units ETUsFunctional overview of the trip unit system ETU725 ETU727 ETU745Setting range of the Ig Basic Functions ETU725 ETU727 ETU745Basic Functions ETU748 ETU755 ETU776 Communication Metering Data Availability on the CubicleBUSData point group ETU745 Data points with the same source 755 orModbus Module COM16 Pin ConfigurationModbus COM16 Module and the BSS Modbus Write Protection DPWriteEnable Modbus Installation GuidelineCubicleBUS + Data Exchange via the COM16 ModuleMeaning Position and text on the cable CubicleBUS Cubicle BUS LED Meaning Rear Microswitch S46 Middle S47 Front S48Meaning PositionBreaker Status Sensor BSS Metering Function Plus GeneralWaveform buffer Metering Function PlusHarmonic analysis VT Accuracy Parameters for the settings of the metering functionVoltage Transformers Maximum distance from voltage transformerMetering range 81THDC Extended Protective Function Important functions/parameters for communicationsLoad Management Minimum for Communicated Currents Normal Positive Power Flow DirectionSetpoints Event and Trip LogExternal CubicleBUS Modules Rotary SwitchesInstallation CubicleBUS Installation Guidelines Power SupplyMaximum CubicleBUS Configuration CubicleBUS LED Meaning LED DisplayMeaning All other LEDs MeaningTesting the Digital Input and Output Modules DeviceFunctional description Technical data for the digital input moduleDigital Input Module Functional description for changing parameter setsSelector switch position to the right Digital Output Module with Rotary SwitchSelector switch position to the left Delay timeConfigurable Digital Output Module Technical data for the digital configurable output module Trigger event Waveform buffer BPower value ranges W/VA Analog Output ModuleTest function Switch position cosTechnical data for the analog output module Example as illustrated in Graphic ZSI ModuleOperating principle Technical data for the ZSI module It trips after tZSI = 50 ms. Time saved = 250 msCommunication-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 02 Read Discrete Inputs COM16 Supported Function CodesFunction 01 Read Coils Reply Message from slave Function 03 Read Holding RegistersRequest Message to slave Function 07 Read Exception Status Function 04 Read Input RegistersFunction 05 Write Single Coil Function 12 Get Communication Event Log Function 08 DiagnosticsFunction 11 Get Communication Event Counter What the Event Bytes Contain COM16 slave Send EventFunction 15 Write Multiple Coils Function 16 Write Multiple Registers Exception Responses Exception Codes Code Name MeaningBasic Data Type 2 Registers and Default Data Points Default Register ListsBasic Data Type 1 Registers and Default Data Points Basic Data Type 3 Registers and Default Data Points Complete List of Datasets Data bytesSample Dataset Min Max BitsBit Mapping for Breaker Status Register Byte Register DescriptionWL Configurator Brief Description Communication-capable Circuit Breakers Breaker Data Adapter BDA Breaker Data Adapter Plus BDA Plus Benefits of the BDA Brief Description and System RequirementsDescription BDA in Offline Mode or BDA Plus BDA as a Hand-Held Device or BDA PlusBDA Plus as an Ethernet Interface Intranet and InternetGetting started with the BDA Plus What is Java?Circuit breaker requirements Permanent Connection to WL Circuit BreakersTemporary Operation Meaning of the LEDs on the BDATechnical data for the BDA and BDA Plus 4This table provides technical data for the BDA and BDA PlusConnection to the BDA via the Serial Communication System Usually have to be changed. They are shown as a referenceBreaker 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 Connection to the BDA Plus via the Ethernet Interface Definition of Key TermsExample IP AddressesSubnet Mask BDA IP AddressLanguages and Help Operating Instructions and TroubleshootingOffline/Online Mode Displaying DataOperation Example Password ProtectionSentron PrintingTroubleshooting List Fault Description Solution Siemens Energy & Automation, Inc Siemens Energy & Automation, Inc. All Rights Reserved