Alpha 6000S series User Manual page 205

Appendix 4 Use of MODBUS Communication
[08H]
Loop Test Command: the command content is fed back originally in the form of response and is used for test of
signal transmission and returning between the main controller and the frequency inverter. Arbitrary values can be
used as the test code and data.
Example: loop feedback test
Command Content
Frequency Inverter
Address
Command Code
Test Code
Test Data
CRC
[10H]
Single-character Writing Command: write the content into the specified register, and write the specified data in the
specified register. The data saved should be among the order of record codes. The command content should be
arrayed in the sequence of high 8 bits and low 8 bits.
Example: set the frequency as 50.0Hz
Command Content
Frequency Inverter
Address
Command Code
Start
Address
Number of
Addresses
Number of Data
Content of
Data
CRC
[10H]
Data Saving Command: write the MODBUS register address corresponding to the function parameters into the
special saving address of 0xFF, and save the parameter content into EEPROM. It is equivalent to ENTER of the
keypad to save the data without being lost. The command content is arrayed in the order of high 8 bits and low 8 bits.
00FFH is specially used for data saving and is effective when Pb.06=0.
Example: set the frequency as 30.0Hz and save it in EEPROM.
204
Normal Response Content
Frequency Inverter
01
08 Command Code
High Bit 00
Test
Code
Low Bit 00
High Bit 12
Test
Data
Low Bit 34
High Bit ED
CRC
Low Bit 7C
Normal Response Content
Frequency Inverter
01
Command Code
10
High Bit 00
Start
Address
Low Bit 02
High Bit 00
Number
of
Low Bit 01
Addresses
02
High Bit 13
CRC
Low Bit 88
High Bit AA
Low Bit E4
Notes: The number of data doubles that of address.
01
Address
08
High Bit 00
Low Bit 00
High Bit 12
Low Bit 34
High Bit ED
Low Bit 7C
01
Address
10
High Bit 00
Low Bit 02
High Bit 00
Low Bit 01
High Bit A0
Low Bit 90
Abnormal Response Content
Frequency
01
Inverter Address
Command Code 88
Abnormality
03
Code
High Bit 06
CRC
Low Bit 01
Abnormal Response Content
Frequency
01
Inverter Address
Command Code
90
Abnormality
03
Code
High Bit 0C
CRC
Low Bit 01