I
4. A2CCPU
--------------------
MELSEC-A
(b) Data is stored to
the
status latch area when
the
SLT instruction is
executed.
With devices which
turn
on/off or store
data
using
the
same condi-
tion,
the
data
to be stored in
the
status latch area differs before and
after
the
execution of
the
SLT instruction.
Example:
If a devicewhich
turns
on and off with
the
same
condition
is present before
and after
the
SLT instruction in a program,
the
ON/OFF state will differ
before and after
the
execution of
the
SLT instruction.
[Circuit example] [Monitor display of status latch data]
I"
I'
When the SLT instruction is
10 10
executed, Y10 is ON; ON is
displayed for the monitor .
•
When
the
SLT instruction is
executed, Y11 is OFF; OFF is
Y11
Y11
displayed for the monitor.
•
(3) Caution
(a) Execution of
the
SLT instruction causes
the
scan time to be in-
creased by
the
value indicated below.
Therefore,
take
this in consideration when determining
the
watch
dog
timer setting and constant scan time setting for
the
A2CCPU
taking
these
into
consideration.
Table
4.6
SLT
Instruction
Execution
Time
--------
Device
Memory
Only
Device
Memory
and File Register
Processing time
11 msec
31
meec
(msec)
4-29
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