8 COMMUNICATION FUNCTION (MITSUBISHI ELECTRIC AC SERVO PROTOCOL) [A]
8.3 Protocol
405
8
Communication procedure example
The following example reads the set value of alarm history (last alarm) from the servo amplifier of station 0.
Data item
Value
Description
Station No.
0
Servo amplifier station No. 0
Command
33
Reading command
Data No.
10
Alarm history (last alarm)
Transmission data =
Other than error code
[A] or [a]?
3 consecutive times?
300 ms elapsed?
Start
Data make-up
Checksum calculation and
addition
Addition of SOH to make up
transmission data
Data transmission
Data receive
3 consecutive times?
Receive data analysis
End
100 ms after EOT transmission
Error processing
Error processing
No
Yes
Yes
Yes
No
No
No
No
Yes
Yes
Master station
Is there receive data?
Command
Data No.
Checksum = 30H + 33H + 33H + 02H + 31H + 30H + 03H =
Slave station
Master station
Slave station
+
+
FCH
[1] [0]
Data
ETX
STX
3
3
1 0
+
+
+
= [0] [3] [3]
= [0] +
ETX
STX
SOH
ETX
STX
3
3
1
0
0
F C
+
+
+
+
46H 43H
Station No.
Master station
Slave station