Omron PLC communication port (RS232, RS485/422) correct use - Database & Sql Blog Articles

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RS232, RS485 and RS422 are the main communication interfaces of the CS series, which are widely used in on-site debugging and device connection.

(1) Correct use of RS232 port

1 Use a shielded cable when making a communication cable.

2 When making the communication cable by yourself, make sure the pin is connected correctly. The pin serial port pin is defined as shown below.

Main pins: 2 is the transmission, 3 is the reception, and 9 is the signal ground.

3 When soldering, please put an insulating sleeve on the lead to avoid soldering or short circuit.

4 Avoid plugging and unplugging the communication cable during communication.

5 Failure to use the RS232 port correctly leads to the following failures.

Incorrect wiring, hot swap or communication interference causes damage to the serial port components on the PLC.

(3) Correct use of RS485/422 port

When using 1485/C200Ha series PLC for RS485/422 communication, you need to select the communication interposer/communication module according to the situation.

2 Use a shielded cable when making communication cables.

3 Pay attention to the pin definition when connecting the communication cable to avoid connection errors.

4 Avoid the short circuit caused by the wire burr at the communication cable connector.

5 Avoid plugging and unplugging the cable in the communication state.

6 Failure to properly connect the RS422/485 port will result in the following faults.

Misconnection or communication interference, resulting in communication loop damage.

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