INVT Goodrive20-UL VFD Series Operation Manual page 135

Goodrive20-UL Series VFD
Code Name
Operation
04H
failure
Password
05H
error
Data frame
06H
error
Parameter
07H
read-only
Parameter
cannot be
08H
modified in
running
Password
09H
protection
The slave uses functional code fields and fault addresses to indicate it is a normal response or
some error occurs (named as objection response). For normal responses, the slave shows
corresponding function codes, digital address or sub-function codes as the response. For
objection responses, the slave returns a code which equals the normal code, but the first byte
is logic 1.
For example: when the master sends a message to the slave, requiring it to read a group of
address data of the VFD function codes, there will be following function codes:
For normal responses, the slave responds the same codes, while for objection responses, it
will return:
Besides the function codes modification for the objection fault, the slave will respond a byte of
abnormal code which defines the error reason.
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 transmitted 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.
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.
0 0 0 0 0 0 1 1 (Hex 03H)
1 0 0 0 0 0 1 1 (Hex 83H)
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Communication protocol
Meaning