Operating instructions

VLT
®
2800, VLT
®
6000 HVAC and VLT
®
8000 AQUA Modbus RTU
Exception
Codes
■ Exception Codes
■ Exception Code Tables
When the frequency converter 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 frequency converter simply echoes the
original function code. For an exception response, the
frequency converter 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 frequency converter
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.
Errors
Modbus
Code
(decimal)
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
04 The parameter is not of the array type
05 Thedatatypedoesnotmatchtheparametercalled
06 Only Reset
07 Not changeable
11 No write access
17 Data change in the parameter called is not possible in the present mode of the freq
uency
converter. Some parameters can only be changed when the motor has stopped.
18 Other error
130 There is no bus access to the parameter called
131 Data Change is not possible because factory setup is selected
Modbus RTU Errors
Modbus
Code
(decimal)
Meaning
64 Invalid Data Address
65 Invalid Message Length
66 Invalid Data Length or Value
67 Invalid Function Code
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