Read/Write Operation Example; Examples Of Reading Command 03H - INVT Goodrive20-UL VFD Series Operation Manual

Goodrive20-UL Series VFD Communication protocol
When the master receives the response for the objection, in a typical processing, it will send
the message again or modify the corresponding order.
For example, set the "running command channel" of the VFD (P00.01, parameter address is
0001H) with the address of 01H to 03, the command is as following:
Parameters
VFD Write Parameters
CRC check
address address data
command
But the setting range of "running command channel" is 0–2, if it is set to 3, because the
number is beyond the range, the VFD will return fault response message as below:
VFD Abnormal
Fault code CRC check
address response code
Abnormal response code 86H means the abnormal response to writing command 06H; the
fault code is 04H. In the table above, its name is operation failed and its meaning is that the
parameter setting in parameter writing is invalid. For example, the function input terminal
cannot be set repeatedly.

7.5 Read/Write operation example

7.5.1 Examples of reading command 03H

Read the state word 1 of the VFD with the address of 01H (see section 7.4.2 "Description of
other function addresses in Modbus"). The parameter address of the state word 1 of the VFD
is 2100H.
The command sent to the VFD:
Parameters
VFD
Read
Data number
CRC check
address
address
command
If the response message is as below:
VFD
Data
Read CRC check
Data content
address
number
command
The data content is 0003H. From the table 1, the VFD stops.
Watch "the current fault type" to "the previous 5 times fault type" of the VFD through
commands, the corresponding function code is P07.27–P07.32 and corresponding parameter
address is 071BH–0720H (there are 6 from 071BH).
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