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Problems with Modbus(PLC Jazz 20 R31)

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Can you give me an advice how to solve the problem.Well,I have PLC Jazz 20 R31

connected to modem(Scada) by RS485(Modbus protocol). Everything works but from time to time the communication between the devices disappears and I have to reset the PLC If I wanna restore the communication. It happens often when some unit(pumps) is switched on.

The file with my Modbus config is attached 

How to solve the problem?

Sincerely Wladimir


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Hi Wladimir,

If problem arise, when pumps start/stop to work, you have to review wiring, especially 0 volt and Grounding.

You can add EMI filters, ferrites coils, etc. to power and sensor wires.

Use “System Wiring Guidelines”


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