IMO HD2-3.7A-43 - Read;Write Operation Example

HD2 Series Inverter Communication
-322-
VFD
address
Write
command
Parameter
address
Parameter
data
CRC
01 06 00 01 00 03 98 0B
But the setting range of the "Channel of running commands" is 0 to 2. The value 3 exceeds the setting
range. In this case, the inverter 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 MSB "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 the formats of the read and write commands, see sections 9.4.1 and 9.4.2.
9.4.8.1 Read command 03H examples
Example 1: Read state word 1 of the inverter whose address is 01H. According to the table of other
Modbus function addresses in section 9.4.5 Data address definition, the parameter address of state
word 1 of the inverter is 2100H.
The read command transmitted to the inverter 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 inverter is 0003H, which indicates that the inverter is in the stopped
state.
Example 2: View information about the inverter whose address is 03H, including "Type of current
fault" (P07.27) to "Type of 5th-last fault" (P07.32) of which the parameter addresses are 071BH to
0720H (contiguous 6 parameter addresses starting from 071BH).
The command transmitted to the inverter is as follows:
VFD
address
Read
command
Start
address
6 parameters in total
CRC
03 03 07 1B 00 06 B5 59