How PLC Controls a Motor ?

 PLC Inputs

• Start push button


• Stop push button


• Vibration High


• Temperature High


• Overload Trip


• Run feedback


• Local/Remote status

PLC Outputs

• Start Command (Remote Start)


• Stop Command (Remote Stop)


• Start Permissive ( Optional)

The motor is a three phase, 415V AC powered device. So by default high voltage equipment will be powered from substations or motor control centers (MCC) which are maintained by electrical. So we consider this motor is connected to a simple motor feeder in the substation. Generally the motor feeder have inputs from field (local control panel) & PLC also. Which are shown in below figure.