22.7 Exception Response Codes
Standard Codes
Description
Exception
Code
Illegal Function 1
Illegal data address 2
Illegal Data Value 3
Slave Device Failure 4
Acknowledge 5
Slave Device Busy 6
Memory Parity Error 8
Gateway Path Unavailable 10
Gateway Target Device Failed To
Respond
11
Manufacturer Codes
Description
Exception
Code
Illegal Block Size (must be two registers for 32-bit and four
registers for 64-bit parameters)
32
Unknown Parameter (bad address) 33
Error Processing Command (such as "Data value is greater
than maximum")
34
Byte Count field is invalid in request 35
AKD User Guide | 22 Modbus
Kollmorgen | December 2010 73
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