Alpha ALPHA6000 Series, Manual

Page: 230 / 243

Appendix 4 MODBUS Communication
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230
Example: 30.00 Hz frequency reference is saved in EEPROM.
Slave Address 01
Function Code 10
Starting
No.
Upper 01
Lower 00
Quantity
Upper 00
Lower 01
No. of Data 02
Data
Upper 0B
Lower B8
CRC
Upper B1
Lower D2
Slave Address 01
Function Code
90
Error Code 23
CRC
Upper 0D
Lower D9
Command Message Normal Response Message AbnomalResponse Message
(ENTER) (Frequency Reference Write)
Slave Address 01
Function Code 10
Starting
No.
Upper 00
Lower FF
Quantity
Upper 00
Lower 01
No. of Data 02
Data
Upper 01
Lower 00
CRC
Upper B3
Lower CF
(Under voltage writing)
Write 2 Register [10H]: With this instruction, the value of the action command (0001)
and the reference frequency (0002) can be modified simultaneously;
Notes:
You should set the operation control mode and frequency-setting mode as serial
communication at the same time.
Example: Start No.1 ac drive as clockwise operating, set the frequency as 50HZ.
（
Pb.05=0
）
Slave Address 01
Function Code 10
Starting
No.
Upper 00
Lower 01
Quantity
Upper 00
Lower 02
No. of Data 04
Data
Upper 00
Lower 01
Upper 13
Lower 88
CRC
Upper 6E
Lower F5
Slave Address
01
Function Code
90
Error Code 03
CRC
Upper 0C
Lower 01
Slave Address
01
Function Code
10
Startin
g No.
Upper 00
Lower 01
Quant
ity
Upper 00
Lower 02
CRC
Upper 10
Lower 08
Command Message Normal Response Message AbnomalResponse Message
Note：
No. of Data is double
Command Message
Quantity