Communication instructions Chapter 9
Rockwell Automation Publication 2080-RM001D-EN-E - February 2015 199
Structured Text (ST)
Modbus error codes
The following table describes error codes for the MSG_MODBUS function
block.
Error code Error description
3 The value of the TriggerType has been changed from 2 - 255.
20 The local communication driver is incompatible with the MSG instruction.
21 A local channel configuration parameter error exists.
22 The Target or Local Bridge address is higher than the maximum node address.
33 A bad MSG file parameter exists.
54 A lost modem.
55 The message timed out in the local processor. A link layer timeout.
217 The user cancelled the message.
129 An illegal function.
130 An illegal data address.
131 An illegal data value.
132 A slave device failure.
133 Acknowledge.
134 The slave device is busy.
135 Negative acknowledge.
136 A memory parity error.
137 A non-standard reply.
255 The channel has been shut down.
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