Modbus Exception Codes - Siemens SENTRON 7KM PAC2200 Product Manual

Appendix
A.1 Modbus TCP
A.1.2

Modbus exception codes

Overview
Table A- 2
Exception
codes
01
02
03
04
F0
98
Modbus exception codes
Name Meaning
Illegal Function Illegal function:
Illegal Data Address Illegal data address
This address is not permissible for
the slave. This is the case, for
example, if the combination of start
offset and transfer length is invalid.
Illegal Data Value Illegal data value:
The request contains a data value
that is not permissible for the slave.
This indicates an error in the re-
maining structure of a complex
request, e.g. an incorrect data
length.
Slave Device Failure Error in processing the data:
An indefinite error occurred when
the slave attempted to execute the
requested action.
Write Protection ON The action has been rejected be-
cause the write protection is set.
The function code in the re-
quest is not a permissible ac-
tion for the slave.
The slave is in a status in which
it cannot process a request of
this type. This is the case, for
example, if it has not yet been
configured and is requested to
return register values.
Equipment Manual, 12/2019, L1V30415167B-03
Remedy
Check which function
codes are supported.
Check the offset and the
number of registers.
Check that the specified
offset and the specified
data length in the com-
mand are correct.
Check that the specified
offset and the specified
data length are correct.
Deactivate write protection.
PAC2200