Inovance MD500-PLUS Series - Page 517

Function Application
‑516‑
Step 2: Use the host controller to send a write command to the AC drive.
The following description takes Modbus as an example to illustrate how to set the
main frequency through communication. For example, to set the frequency reference
to 10000 through communication, send the write command 01 06 10 00 27 10 97 36.
The following table shows the meaning of each byte in the command.
Byte
Meaning
01H (editable) AC drive address
06H
Write command
1000H
Frequency reference address
2710H (10000 in decimal) Target frequency
9736H
CRC check
Similarly, to set the frequency reference to –10000 through communication, send the
write command 01 06 10 00 D8 F0 D7 4E. In this command, D8F0 is the lowest four bits
of the hexadecimal number converted from –10000.
Figure 3‑23 Parameter settings when the main frequency is set through communication
Table 3–2 Relationship between master commands and slave responses
Master Command Slave Response
ADDR 01H ADDR 01H
CMD 06H CMD 06H
Parameter address
high bits
10H
Parameter address
high bits
10H
Parameter address
low bits
00H
Parameter address
low bits
00H
Data content high
bits
27H
Data content high
bits
27H
Data content low
bits
10H
Data content low
bits
10H
CRC high bits
97H
CRC high bits
97H
CRC low bits
36H
CRC low bits
36H