Exception Codes; Modbus Measured Variables With The Function Codes 0X03 And 0X04; Table 5-3 Modbus Exception Codes - Siemens SENTRON PAC RS485 Manual

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5.1.4

Exception codes

Overview
Table 5-3
Exception codes
01
02
03
04
5.1.5

Modbus measured variables with the function codes 0x03 and 0x04

Measured variables of the SENTRON PAC Power Monitoring Device
The measured variables are provided by the SENTRON PAC Power Monitoring Device. You
can use the MODBUS function codes 0x03 and 0x04 on all the measured variables listed
below.
PAC RS485
Manual, 02/2008, A5E02091800B-01
MODBUS exception codes
Name
Meaning
Illegal
Illegal function:
Function
Illegal Data
Illegal data address
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
Illegal data value:
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.
Slave Device
Error in processing the data:
Failure
An indefinite error occurred when
the slave attempted to execute the
requested action.
Parameter assignment/Addressing
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
configured and is requested to
return register values.
5.1 MODBUS RTU
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
command are correct.
Check that the specified
offset and the specified
data length are correct.
33

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