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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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