ABB REJ603 Feeder Protection Relay

ABB REJ603 Feeder Protection Relay

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The Modbus protocol establishes the format for the master's query byplacing into it the device (or broadcast) address, a function code defin-ing the requested action, any data to be sent, and an error-checkingfield. The slave's response message is also constructed using Modbusprotocol. It contains fields confirming the action taken, any data to bereturned, and an error-checking field. If an error occurred in receipt ofthe message, or if the slave is unable to perform the requested action,the slave will construct an error message and send it as its response. 

The Query: The function code in the query tells the addressed slavedevice what kind of action to perform. The data bytes contain any addi-tional information that the slave will need to perform the function. Forexample, function code 03 will query the slave to read holding registersand respond with their contents. The data field must contain the infor-mation telling the slave which register to start at and how many regis-ters to read. The error check field provides a method for the slave tovalidate the integrity of the message contents.

ABB REJ603 Technical drawing:

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