Different motor control modes

[Bill]

Hello everyone,

I would like to know the different types of communication between an electric motor and a Siemens 1200 PLC. Although this depends on the type of motor used, I am particularly interested in the different connection modes. Are there (specific interfaces or connectors, relay) between these two systems?

Thanks

[Doctorandus_P]

PLC's only do low power signals. So the interfaces would be something like a contactor, Frequency inverter, BLDC / Servo motor controller etc. Communication protocols can be anything from a few logic signals (contactor on) or to direct to inputs of the controller (on/off, forward/reverse) to any of the common industrial buses. (Modbus, EtherCAT, 4-20mA, HART etc).

[BeBuLamar]

Often the PLC doesn't communicate with the motor directly. Generally the PLC would communicate with a motor drive either AC inverter or DC drive. The communication can be Profibus, Modbus RTU in the old days or today Profinet, Modbus TCP/IP, Ethernet IP, Ethercat, Powerlink etc... these use an ethernet connection.