GD350A series high-performance multifunction VFD
-296-
VFD
address
Write
command
Parameter
address
Parameter
data
CRC
01
06 01 14 00 32 49 E7
After receiving the command, the VFD converts 50 into 5.0 based on the fieldbus scale, and then sets
"Wake-up-from-sleep delay" to 5.0s.
For another example, after the upper computer transmits the "Wake-up-from-sleep delay" parameter
read command, the master receives the following response from the VFD:
VFD
address
Write
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.
9.4.7 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 sent from the VFD to the master. The following table describes the
codes and definitions of the error message responses.
Code
Name
Description
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
value
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
The parameter is set to an invalid value in the write operation. For
