Diagnostics and Troubleshooting
User Manual
6.5 Communication Error Codes
MVI69E-MBS ♦ CompactLogix Platform
Modbus Serial Enhanced Communication Module
Note: If an error code is reported that is not listed below, check with the documentation of the
Modbus device(s) on the module's application ports. Modbus devices can produce device-specific error codes.
4
5
6
Code
1
2
3
6.5.1 Standard MODBUS Protocol Exception Code Errors
Description
Illegal Function Code
Illegal Data Address
Illegal Data Value
Failure in Associated Device
Acknowledge
Busy, Rejected Message
Code
-1
-2
-11
253
254
255
6.5.2 Module Communication Error Codes
Description
CTS modem control line not set before transmit
Timeout while transmitting message
Timeout waiting for response after request
Incorrect slave address in response
Incorrect function code in response
Invalid CRC/LRC value in response
Code
-41
-42
-43
-44
-45
-46
6.5.3 Command List Entry Errors
Description
Invalid enable code
Internal address > maximum address
Invalid node address (< 0 or > 255)
Count parameter set to 0
Invalid function code
Invalid swap code
Page 100 of 154 ProSoft Technology, Inc.
June 28, 2017
