Appendix
A.1 Modbus
112
PAC3120 and PAC3220
Equipment Manual, 10/2019, L1V30425208F-01
A.1.2 Exception codes
Overview
Table A- 2 Modbus exception codes
01 Illegal Function Illegal function:
• The function code in the request 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 con-
figured and is requested to return register
values.
Check which function
codes are supported.
02 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.
Check the offset and
the number of regis-
ters.
03 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 remaining structure of a complex request,
e.g. an incorrect data length.
Check that the speci-
fied offset and the
specified data length in
the command are
correct.
04 Slave Device Failure Error in processing the data:
An indefinite error occurred when the slave
attempted to execute the requested action.
Check that the speci-
fied offset and the
specified data length in
the command are
F0 Write Protection ON The action has been rejected because the write
Deactivate the write
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