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When do I change the Unit ID of Modbus/TCP equipment from 255 to a specific value in Vijeo Designer?
Customers that are having the Magelis communicate to a Modbus/TCP to Modbus/RTU devices.
Vijeo Designer, Magelis HMI
If you are using a Modbus/TCP to Modbus serial RTU Gateway device, each device on the serial network will have a Modbus slave address associated with that device. That Modbus slave address is your Unit ID.