Modbus Exception Codes - Siemens SENTRON PAC2200CLP Product Manual

Appendix
A.1 Modbus TCP
A.1.2

Modbus exception codes

Overview
Table A- 2
Exception codes
01
02
03
04
F0
94
Modbus exception codes
Name Meaning
Illegal Func- Illegal function:
tion
•
•
Illegal Data Illegal data address
Address
This address is not permissible for
the slave. This is the case, for ex-
ample, if the combination of start
offset and transfer length is invalid.
Illegal Data Illegal data value:
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 Error in processing the data:
Failure
An indefinite error occurred when
the slave attempted to execute the
requested action.
Write Protec- The action has been rejected be-
tion ON cause the write protection is set.
The function code in the re-
quest is not a permissible action
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, 06/2021, L1V30820585B-02
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 protec-
tion.
PAC2200CLP