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3.
SP,EClFlCATlONS
_ . -
I
MELSEC-A
Table
3.11 AlSD71 t/O
Interfaces
7
Signal
Description
Internal
circuit
Pin Number
X axis
I \
I
t
5A
Common
5 to 24 VDC (external supply)
(1) LOW indicates the servo drive unit is serviumblc
(2) The AlSD71 chacks the drlvo
unit ready signa
and the f a d puke is w t a b k .
prior to start.
11
not ready, the AlSD71 outputs
I
zero return request.
(3) Arrange for drive unit errors, e.g. a oontrol powe
error, to set this signal HIGH.
(4) Switching the
signal to HIGH during positioning
stops the operation. Resetting the signal will no
restart the operation.
~~
Drive unit
ready
( R E A D Y )
\
-
\
-
8 A
-
88
(1) LOW to stop positioning. Signal duration 20 msec
or more.
(2) AlSD71 stops positioning by using this signal anc
switches thestartsignalOfF (HIGH). Whenswitch
ing from HIGH to LOW, positioning is not started.
Stop signal
( S T O P )
(1) Used to
detect near-point during zero return
Switched to LOW by using the near-point actuator
(2) When zero return by using the zero-phase signal
The grid point is resolver p h u e angle
0.
the zero point is away from the dog and becomes
the firat grid point after detecting
the near-poin
dog.
Zero-point
signal
( D O G )
Input
-
3A
(1) Selects the control switching signal enableldisable
(2) LOW sets enable.
Enable signal
38
t
4A
-
4 0
-
1 OA
Control
switching
signal
11) Used as
the control
Switching command
in the
:2) LOW switches control.
speedd/positioning control switching mode.
Zero-phase
signal
( P G O )
:1) Used as the zero signal at zero return. The zero.
phase grid signal of the pulse encoder is normally
:2) Used when the zero return method uses stoppel
used. LOW at zero.
stop
and zero return complete is externally
input.
1 OB
-
3
-
73
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