Hello. I have  some problem

CM ptp is connected 4 plant equipment via modbus 485.

But module become abnormal two times a month. No Tx, Rx LED blink. CPU Stop-Run is required for normal state.

Only due to equipment noise? Let me know what the solution is. thank you

Hello,

generally good cable and proper termination is required. With other check, tests look to this topic (link): Modbus RTU freezing

https://support.industry.siemens.com/tf/us/en/posts/modbus-locks-up/163078/?page=0&pageSize=10

Solved with software. But add signal isolator, SPD for the hardware solution.