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3. SPECIFICATIONS
MELSEC-A
Detailed explanation of I/O signals
This section explains ON/OFF timing of 1/0 signals and I 1 0 signal condi-
tions. The numbers in
( )
shows the device number that corresponds to
Table 3.9.
Fig 3.49 gives details about ON/OFF timing of I/O signals.
(1) Watchdog timer error signal (X10)
Switches ON when a WDT error occurs by using the AlSD71 self-diag-
nostic function.
(2) AlSD71
ready signal (X1
1)
Switches ON according to the ON/OFF state
of the PC ready signal
(Y2D). However, following time (t), the AlSD71 ready signal (X1 1 ) must
be turned ON after checking parameter and
zero return data when the
PC ready signal (Y2D) goes ON.
Use this signal for the interlock in the sequence program.
PC
ready signal (Y2D)
AlSD71 ready signal (X1 1)
I
,
I U I
I
1
I
,
t =
1.5 sec
(3) Positioning complete (X12, X13)
Switches on for a period
set in the parameters after each
position is
reached. (Ignored if the positioning complete signal output time
= 0.)
Switched off at positioning start, Zero return start, inching start, jog start,
and power on.
If
positioning is stopped midway, the positioning complete signal does
not switch on.
Positioning complete signals do not go on in the speed control mode.
Switches on at positioning start, Zero return start, inching start, and jog
start. Switches off after pulse output and dwell time have elapsed.
(Refer to Fig. 3.49.) (Remains on during positioning.)
Switches on while the test function is being used on the peripheral device
or the AD71TU.
(4) BUSY (X14,
X15)
3
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