Initialization; Communication Procedure Example - Mitsubishi Electric Melservo MR-J3-A Instruction Manual

13. COMMUNICATION FUNCTION

13.3.7 Initialization

After the slave station is switched on, it cannot reply to communication until the internal initialization processing
terminates. Hence, at power-on, ordinary communication should be started after:
(1) 1s or more time has elapsed after the slave station is switched on; and
(2) Making sure that normal communication can be made by reading the parameter or other data which does
not pose any safety problems.

13.3.8 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
Station number
Command
Data No.
Checksum calculation and
addition
Addition of SOH to make
up transmission data
Yes
No
3 consecutive times?
Yes
Error processing
Description
0 Servo amplifier station 0
33 Read command
10 Alarm history (last alarm)
Start
Data make-up
Data transmission
Data receive
No
Is there receive data?
Yes
300ms elapsed?
3 consecutive times?
Other than error code
[A] [a]?
No
Error processing
Receive data analysis
End
Axis No. Command
Data No.
Data [0] 3 3 STX 1 0
[0][3][3] [1][0]
STX
Checksum 30H 33H 33H 02H 31H 30H 03H FCH
Transmission data SOH
No
Yes
No
Yes
100ms after EOT transmission
13 - 9
ETX
ETX
0 3 3 STX 1 0 ETX
Master station slave station
Master station slave station
Master station slave station
F C 46H 43H