Goodrive350 IP55 High-ingress Protection Series VFD
Communication protocol
-285-
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
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.
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 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.
