Goodrive18 series two-in-one VFD Communication
-133-
not allowed. The value indicates the error of the
remaining structure in the combined request.
Note: It does not mean that the data item submitted
for storage in the register includes a value
unexpected by the program.
The parameter is set to an invalid value in the write
operation. For example, a function input terminal
cannot be set repeatedly.
The password entered in the password verification
address is different from that set in P07.00.
The length of the data frame sent by the upper
computer is incorrect, or in the RTU format, the
value of the CRC check bit is inconsistent with the
CRC value calculated by the lower computer
The parameter to be modified in the write operation
of the upper computer is a read-only parameter.
Parameter
cannot be
modified in
running
The parameter to be modified in the write operation
of the upper computer cannot be modified during
the running of the VFD.
A user password is set, and the upper computer
does not provide the password to unlock the
system when performing a read or write operation.
The error of "system locked" is reported.
When returning a response, the slave uses a function code domain and fault address to
indicate whether it is a normal response (no error) or exception response (some errors occur).
In a normal response, the slave returns the corresponding function code and data address or
sub-function code. In an exception response, the slave returns a code that is equal to a normal
code, but the MSB is logic 1.
For example, if the master sends a request message to the slave for reading a group of
function code address data, the code is generated as follows:
0 0 0 0 0 0 1 1 (03H in the hexadecimal form)
In a normal response, the slave returns the same function code. In an exception response, the
slave returns:
1 0 0 0 0 0 1 1 (83H in the hexadecimal form)
In addition to the modification of the code, the slave returns a byte of exception code that
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