Goodrive600 series high-performance multifunction VFD
Communication networking
-129-
VFD
address
Read
command
Parameter
data
CRC
2-byte
data
01
03
02
00 32
39 91
The parameter data is 0032H, that is, 50, so 5.0 is obtained based on the fieldbus scale (50/10=5.0). In this case, the
master identifies that the "Wake-up-from-sleep delay" is 5.0s.
6.3.6 Error message response
Operation errors may occur in communication-based control. For example, some parameters can only be read, but a
write command is transmitted. In this case, the VFD returns an error message response.
Error message responses are transmitted by the VFD to the master. The following table describes the codes and
definitions of the error message responses.
Code
Name
Definition
01H
Invalid
command
The command code received by the upper computer is not allowed to be
executed. The possible causes are as follows:
The function code is applicable only on new devices and is not
implemented on this device.
The slave is in the faulty state when processing this request.
02H
Invalid data
address
For the VFD, the data address in the request of the upper computer is not
allowed. In particular, the combination of the register address and the number
of the to-be-transmitted bytes is invalid.
03H
Invalid data
bit
The received data domain contains a value that is 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.
04H
Operation
failure
The parameter is set to an invalid value in the write operation. For example, a
function input terminal cannot be set repeatedly.
05H
Password
error
The password entered in the password verification address is different from
that set in P07.00.
06H
Data frame
error
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
07H
Parameter
read-only
The parameter to be modified in the write operation of the upper computer is a
read-only parameter.
08H
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.
09H
Password
protection
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 device 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 device returns the
corresponding function code and data address or sub-function code. In an exception response, the device returns a code
that is equal to a normal code, but the first bit is logic 1.
For example, if the master device transmits a request message to a slave device 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)
