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GD350A series high-performance multifunction VFD
-298-
VFD
address
Read
command
Parameter
address
Parameter
data
CRC
01
06
00 01
00 03
98 0B
However, the setting range of the "Running command channel" is 0 to 2. The value 3 exceeds the
setting range. In this case, the VFD returns an error message response as shown in the following:
VFD
address
CRC
Error code
Exception
response code
01
86
04
43 A3
The exception response code 86H (generated based on the highest-order bit "1" of the write command
06H) indicates that it is an exception response to the write command (06H). The error code is 04H.
From the preceding table, we can see that it indicates the error "Operation failure", which means "The
parameter is set to an invalid value in the write operation".
9.4.8 Read/Write operation example
For details about the formats of the read and write commands, see sections 9.4.1 and 9.4.2.
9.4.8.1 Examples of read command 03H
Example 1: Read status word 1 of the VFD whose address is 01H. According to the table of other
function addresses, the parameter address of status word 1 of the VFD is 2100H.
The read command transmitted to the VFD is as follows:
Read
command
VFD
address
CRC
Parameter
address
Data quantity
01
03
21 00
00 01
8E 36
Assume that the following response is returned:
Read
command
Number
of bytes
Data content
CRC
VFD
address
01
03
02
00 03
F8 45
The data content returned by the VFD is 0003H, which indicates that the VFD is in the stopped state.
Example 2: View information about the VFD whose address is 03H, including "Present fault type"
(P07.27) to "5th-last fault type" (P07.32) of which the parameter addresses are 071BH to 0720H
(contiguous 6 parameter addresses starting from 071BH).
The command transmitted to the VFD is as follows:
VFD
address
Read
command
Start
address
6 parameters in total
CRC
03
03
07 1B
00 06
B5 59