Fuji Electric ALPHA7, User Manual

Page: 555 / 662

CHAPTER 13 MODBUS RTU COMMUNICATION
13-16
Transmission Protocol
13
(3) Message examples
Shows a message example to write in immediate speed, immediate acceleration time and
communication CONT signal, and read out feedback speed, effective torque, and motor current.
The write in start address is 6000H, and the read out start address is 6008H.
First, set parameter Nos. for the free assignment of addresses for parameters PA3_41 to PA3_44.
After setting, reboot to enable the settings.
PA3_41: 007993292
PA3_42: 00000000 (default)
PA3_43: 00040500
PA3_44: Set 00000000 (default)
<Query example>
Station No. 1 byte 01
・
When the amplifier station no. is " 1 ".
FC 1 byte 17
Information
Read out start
address
2 bytes
60 ･･･
Specify the read out first address.
08
No. of registers
2 bytes
00 ･･･
Specify 0006h as the number of data 3×2.
06
Write in start
address
2 bytes
60 ･･･
Specify the write in first address.
00
No. of registers
2 bytes
00
･･･
Specify 0006h as the number of data 3×2.
06
No. of data bytes 1 byte
0C ･･･
Specify 3×4 = 0Ch .
Data 1 4 byte
00 ･･･ Specify immediate speed: 186A0h (1000
r/min) .
01
86
A0
Data 2 4 byte
00 ･･･ Specify immediate acceleration time: 3E8h
(100 ms) . 00
03
E8
Data 3 4 byte
00 ･･･ Specify communication CONT signal: servo
ON and FWD.
00
00
03
CRC check
16 bits
(2 bytes)
CC
17