GD310-UL series VFD
Communication protocol
-205-
The slave uses functional code fields and fault addresses to indicate it is a normal response or some
error occurs (named as objection response). For normal responses, the slave shows corresponding
function codes, digital address or sub-function codes as the response. For objection responses, the
slave returns a code which equals the normal code, but the first byte is logic 1.
For example: when the master sends a message to the slave, requiring it to read a group of address
data of the VFD function codes, there will be following function codes:
0 0 0 0 0 0 1 1 (Hex 03H)
For normal responses, the slave responds the same codes, while for objection responses, it will
return:
1 0 0 0 0 0 1 1 (Hex 83H)
Besides the function codes modification for the objection fault, the slave will respond a byte of
abnormal code which defines the error reason.
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:
VFD
address
Write
command
Parameters
address
Parameters
data
CRC check
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
address
CRC check
Fault code
Abnormal
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.
10.4.8 Example of writing and reading
Refer to 10.4.1 and 10.4.2 for the command format.
10.4.8.1 Example of reading command 03H
Read the state word 1 of the VFD with the address of 01H (refer to table 1). From the table 1, the
parameter address of the state word 1 of the VFD is 2100H.
Summary of Contents for GD310-011P-4-UL
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