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78
Manual – MOVI-PLC® advanced DHR41B for EtherNet/IP, Modbus/TCP and PROFINET IO
8
Fault codes (exception codes)
The Modbus Protocol (Modbus/TCP)
8.5
Fault codes (exception codes)
If an error occurs when processing a function code, the Modbus client is informed in an
exception response
. The following
exception codes
can be reported by SEW devices:
Exception
code (hex)
Name
Meaning
01
ILLEGAL FUNCTION
The function code transferred to the request is not sup-
ported by the slave unit.
02
ILLEGAL DATA ADDRESS
You have entered an invalid data address for the access
to the Modbus slave. This can be due to the following
reasons:
•
Invalid start address when accessing the register of
the Modbus slave (not available or the function code
cannot be used on this address)
•
Invalid start address/length combination
•
No symmetric access with read/write
•
Wrong object ID (on access via FC43)
03
ILLEGAL DATA VALUE
A part of the data field of the Modbus request contains a
value invalid for the Modbus slave. This can be due to
the following reasons:
•
The 'Word count' contains an invalid value (smaller
than 1 or larger than 125)
•
The received PDU length is too short or too long
(depending on the specified 'word count')
•
Internal fault while reading/writing the process data
04
SLAVE DEVICE FAILURE
Fault while accessing MOVILINK
®
parameters (e.g.
internal timeout)
06
SLAVE DEVICE BUSY
There is already a controlling connection (either via
another Modbus controller or another fieldbus system)
0A
GATEWAY PATH UNAVAILABLE The data cannot be transferred to a subsystem.
0
0
I
Содержание DHR41B
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