Zero Return - Mitsubishi MELSEC-A A1SD71-S2 User Manual

6. PROGRAMMING
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M . S L S E G A
6.3.8 zero return
(1)
Flow chart
Switch off PC ready
signal (Y2D).
t
Write parameters and
zero ruturn data to buffer
memory.
!
Switch on PC ready
signal (Y2D).
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Switch on zero ruturn
start (Y23, Y24).
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After zero ruturn switch off
zero ruturn start. (Y23,
complete?
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ON
.
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Complete
(2)
Conditions
Table 6.7 Zero Return Conditions
Signal
Remarks
State
External
signal
ON Drive unit READY
Stop signal STOP
AlSD71 ready (X11)
OFF
OFF
commenced (X18,X19)
Relevant axis positioning
OFF Relevant axis busy (X14, X15)
ON
Interface
signal
plete (XlC,XlD)
Relevant axis zero ruturn com-
Relevant axis M code ON
(X1 E, X1 F)
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OFF
- t o p (Y25, Y26)
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ON
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PC ready (Y2D)
1
ON
I *
1
Zero return data
~~
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NO
error
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Others
Repetition of zero ruturn start
Max. twice
consecutively.
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Neither axis should be BUSY after BREAK (peripheral device) or STOP
(AD71 TU) has been received and positioning has stopped.
'In peripheral device or AD71TU test mode, X11, X18, X19, XlE, X1F and Y2D
should not be checked.
(3) Timing
Zero ;eturn speed
Creep speed
Speed
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PC ready (Y2D)
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r
AlSD71 ready (X1
1)
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Zero return complete (XlC)
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Positioning complete (X12)
----
Start of other
than zero
ruturn
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Stop (Y25)
Positioning commenced (X18)
BUSY (X14)
Zero return request (Xl6)
- - y y 9 - ,
Zero return start (Y23)
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