We have a control logix system in an existing old plant.Now we need to connect a RTU to this system to transmit some datas from the PLC.I think modbus is the only way to connect RTU to control logix plc.Do we need to add any PLC code in the plc to establish modbus communication between PLC and RTU.which port we can use for communication.ethernet or Serial port ?
Modbus RTU from control logix system
- Thread starter srv
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