IPE300 series engineering VFD Communication protocol
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master is to send the request message again or modify the command based on the fault information.
For example, to set the "Channel of running commands" (P00.01, the parameter address is 0000H) to
03 for the VFD whose address is 01H, the command is as follows:
VFD
address
Write
command
Parameter
address
Parameter
data
CRC
01 06 00 01 00 03 98 0B
However, the "Running command channel" ranges from 0 to 2. The value 3 is out of 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, which indicates "Operation failure".
9.4.8 Reading and writing examples
For the formats of the read and write commands, see section 9.4.1 and 9.4.2.
9.4.8.1 Example of reading command 03H
Example 1: Read state word 1 of the VFD whose address is 01H. According to the table of other
Modbus function addresses, the parameter address of state 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
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