
IEC61131 User and Reference Manual
April 22, 2008
Protocol format errors are the number of received
messages that don't have the correct framing or
internal formatting. This is a count of how many
messages are garbled.
For Modbus ASCII this includes:
start of message missing
end of message missing
unexpected start of message inside message
unexpected end of message
invalid characters in message
For Modbus RTU this includes:
received data is too short to be a message
received data is too long to be a message (it
didn't fit in the 256 byte buffer).
Protocol checksum errors are the number of received
messages with a bad checksum.
Protocol master commands sent
Protocol master responses received
Protocol slave commands received
Protocol slave responses sent
Protocol master command status
0 = message sent, waiting for response
1 = response received, no error occurred
2 = not used
3 = bad value in function code register
4 = bad value in slave controller address register
5 = bad value in slave register address
6 = bad value in length register
7 = not used
8 = not used
9 =specified protocol is not supported by this
controller
Protocol forwarded messages
See Also
mbusinfo
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