The power part, control part, programmable controller, and I/O power supply should be wired separately, 

and the isolation transformer should be connected with the programmable controller and the I/O power 

supply with twisted pairs. 

The power line of the system is thick enough to reduce the line voltage drop when the large-capacity

asynchronous motor starts . (B&R X20BC0087 Bus Controller, Siemens 6ES7322-1FH00-0AA0 SIMATIC S7-300 Digital Output Module, Allen Bradley 1771-OBD Output Module, B&R X20BC8083 Bus Controller)If conditions permit, a separate power supply circuit can be used for the programmable controller to avoid the interference of the start and stop of other.

The power supply of the programmable controller can be taken from the lighting line, and the interference signal on the lighting line is relatively smaller than that on the power line.

The external DC power supply for the external input circuit is best to use a stable power supply. 

The power supply that only rectifies and filters the AC voltage contains strong ripples, which may cause 

the programmable controller to receive wrong information.

Have interest in above parts? get in touch with Vivi (sh_plc@163.com).