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Modbus tcp errors?
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Hi Neil,
I have seen similar errors on my system, when the PLC replies with nonsense. The HW of mine has a limitation on how many registers can be queried on one call. Error what i have seen is "Exception from modbus master: Unsupported IP protocol id: 1"
The topic about it is here http://mango.serotoninsoftware.com/forum/posts/list/549.page
If this happens all the time and not just randomly, you could take a capture of the messages with wireshark. It would help on checking what are the message content.
BR
-Jokke
