4. A2CCPU
--------------------
MELSEC-A
I
(3) Caution
(a) The constant scan time setting value stored in D9020 is cleared to
zero (0) when
the
A2CCPU is powered up or reset using
the
RUN
switch.
Therefore, it is necessary to write
the
following program if constant
scan is required from
the
first scan immediately after
the
A2CCPU
is started or reset.
I
D9020
H
I
K [ J [ J
I MOVP
Normally ON contact
.>
~0~16~
__
-[~~
It
___
Constant scan time setting value
(b) If a momentary power failure of less
than
20 msec has occurred,
the
constant scan time is lengthened accordingly. In
this
case,
the
constant scan function is not executed correctly.
(c) If a peripheral device is connected to
the
A2CCPU,
the
set scan time
is lengthened by
the
time (0.2 msec) required
for
communication
between
the
A2CCPU and
the
peripheral device.
It
4-21
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