<![CDATA[Modbus tcp errors?]]>hi,

can anyone help with this please?

http://elecref.co.uk/files/scada.PNG

thanks

Neil

]]>https://forum.mango-os.com/topic/605/modbus-tcp-errorsRSS for NodeWed, 13 May 2026 15:38:45 GMTFri, 29 Oct 2010 07:58:18 GMT60<![CDATA[Reply to Modbus tcp errors? on Fri, 29 Oct 2010 15:05:48 GMT]]>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

]]>https://forum.mango-os.com/post/4764https://forum.mango-os.com/post/4764Fri, 29 Oct 2010 15:05:48 GMT