Communication problem m221 with nordac sk530

Hello to everyone

I have plc m221 and communicate with Nordac 530 the commincation is modbus.The problemm is that sometimes it lost the communication and this time the drive its stop for ten seconds and start again what must do to fix this.
Thanks.

Since you have communication most of the time, the cable is correct. I would first check to make sure that the shield of the communication cable is connected to one end only.
Make sure that the communication is run in a separate conduit. This should be isolated from all of the power lines.

Regards,

If not fitted, you may want to add termination resistors and Bias resistors to your RS485 network.