I
•
4. A2CCPU
--------------------
MELSEC·A
(3) Clearing the latched data
(a) To clear the latched data to
the
initial value, "latch clear" is per-
formed.
"latch
clear" also clears unlatched device data, as men-
tioned below.
After the latch clear operation, the data in
the
each device is set to
the
following:
1) Y, MIllS, F, B
Turned off
2) Special relays
Data is retained
3) T, C
Contacts and coils are turned off; present value is set to O•
4) 0, Z, V, W, A
Data is set to zero.
5) R
Data is retained.
6) Special registers
Data is retained.
(b)
latched
data can be cleared in either of the following
two
methods.
1) Using the RUN switch
QTurn
the
RUN switch from
the
STOP position to
the
L.ClR
position three times.
iQ
The RUN
lED
starts flashing. This indicates
that
the
latched
data is ready to be cleared.
iiQ
Turn the RUN switch from
the
STOP position to
the
L.ClR
position while the RUN
lED
is flashing;
the
latched data is
cleared.
POINi'T
To cancel
the
data latch clear operation, turn the RUN switch to
the
RUN
or RESET position while the latch clear operation is being attempted.
(1) RUN position
The A2CCPU starts operation in the same manner as when the RUN
switch is placed in the RUN position from the STOP position.
(2) RESET
position:
The A2CCPU is reset.
2) Using GPP/PHP/HGP
"All
DEVICE CLEAR" of the test functions in
the
PC
mode
can
be used for latch clear. (For details, read
the
GPP/PHP/HGP
Operating Manual.)
4-23
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