INVT GD20-0R4G-2-UL, Руководство по эксплуатации

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Goodrive20-UL Series VFD Communication protocol
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If there is one figure behind the radix point in the setting range or the default value, then the
fieldbus ratio value is 10. if the data received by the upper monitor is 50, then the "hibernation
restore delay time" is 5.0 (5.0=50÷10).
If Modbus communication is used to control the hibernation restore delay time as 5.0s. Firstly,
5.0 can be magnified by 10 times to integer 50 (32H) and then this data can be sent.
VFD
address
Write
command
Parameters
address
Data number
CRC check
After the VFD receives the command, it will change 50 into 5 according to the fieldbus ratio
value and then set the hibernation restore delay time as 5s.
Another example, after the upper monitor sends the command of reading the parameter of
hibernation restore delay time ,if the response message of the VFD is as following:
VFD
address
Read
command
Parameters
data
CRC check
2-byte
data
Because the parameter data is 0032H (50) and 50 divided by 10 is 5, then the hibernation
restore delay time is 5s.
7.4.4 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 Meaning
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