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Changing the Modbus-RTU slave address on Rockwell Micro 820

thread791-471760

Changing the Modbus-RTU slave address on Rockwell Micro 820

Changing the Modbus-RTU slave address on Rockwell Micro 820

(OP)
I am using a Rockwell Micro 820 configured as a Modbus-RTU slave device.

Is there a way for the user to change the slave address without giving him access to the application code?

RE: Changing the Modbus-RTU slave address on Rockwell Micro 820

Check out the RMCC (Run Mode Configuration Change) function described on pages 23-26 (pdf) of Micro820 Programmable Controllers User Manual

It sounds like it might do what you're asking:

RE: Changing the Modbus-RTU slave address on Rockwell Micro 820

(OP)
That works. And it's fairly straightforward once the MSG_CIPGENERIC function is properly configured.

I am now able to change the Modbus RTU unit addresses from the HMI or via jumpers on PLC inputs.

I was also able to use the same method to set the Ethernet IP address.

Thanks You!

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