Modbus error sometimes

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17 May 2024 02:28 #300792 by Vorms
Modbus error sometimes was created by Vorms
Hello, we are very disappointed because sometimes we have modbus error on the machine. We don't understand what happens. We pay attention for cable, I add terminaison resistors.
I don't understand what error messages means.
It's like electrical problem ?

Many thanks to help me understand error message..
Best regards
Thierry
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18 May 2024 20:35 #300935 by andypugh
Replied by andypugh on topic Modbus error sometimes
It's hard to say what is wrong from the trace, and I have not used Classic Ladder Modbus, but is it possible to reduce the polling rate? Possibly the modbus devices is being asked to responf more frequently than it is capable of.

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18 May 2024 21:09 #300939 by PCW
Replied by PCW on topic Modbus error sometimes
You might also try  a common mode choke (large ferrite bead)
on the RS-485 side to see if this is noise related.

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