29
Exception
Codes
When the drive responds to the master via
the Modbus serial network, it uses the function
code field to indicate either a normal (error-
free) response or an error (called an exception
response). In an error-free response, the drive
simply echoes the original function code. For
an exception response, the drive will return a
code that is equivalent to the original function
code with its most-significant bit set to a logic
1. In addition, the drive places a unique code
into the data field of the response message.
This tells the master what kind of error
occurred, or the reason for the exception. The
tables below identify the codes and describe
their meaning.
Modbus Code
(hexadecimal)
Meaning
00
The parameter number does not exist.
01
There is no write access to the parameter.
02
The data value exceeds the parameter limits.
03
The used sub-index does not exist.
17
Data change in the parameter called is not possible in the present
mode of the drive. Some parameters can only be changed when
the motor has stopped.
40
Invalid data address
41
Invalid message length
42
Invalid data length
43
Invalid function code
82
There is no bus access to the parameter called
Exception Codes
Summary of Contents for Mobrus RTU TR1 Series
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