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MELSEC-A
6 SEQUENCE PROGRAM USED FOR POSITIONING CONTROL
Machine zero point return operation timing and process time
Positioning start
signal
BUSY signal
Start complete signal
Waiting
In zero point return
Waiting
Position command
Positioning operation
t1
t4
t2
t3
Md.35 Axis operation status
Zero point return request flag
[ Md.40 Status:b3]
[Y10,Y11,Y12]
[X4,X5,X6]
[X1,X2,X3]
Zero point return complete flag
[ Md.40 Status:b4]
Fig. 6.8 Machine zero point return operation timing and process time
Normal timing time Unit: ms
t1 t2 t3 t4
5 to 15 0 to 3.5
•
The t1 timing time could be delayed by the following factors.
1) Presence of FROM/TO command execution during start process
2) Operation state of other axes
3) Presence of intervention from peripheral device during start process
4) Details of positioning data to be started
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