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4.
AXCPU
/MELSEC-A
(3)
Clearing the latched data
(a) To clear the latched data to the initial value, ”latch clear” is
performed. “Latch clear” clears unlatched device data
also,
as mentioned below.
After the latch clear operation, the data
in
the each device
is set to the following:
1)
y,
M/US,
F,
B
.............................
Turned
off
2) Special relays (9000 to 9255)*.***.*. Data is retained
3)
T,C
..........................................
Contacts and coils are
turned
off;
present
value is set to
0.
Data is set to zero.
Data is retained.
6)
Special registers
(9000
to 9127).... Data is retained.
4)
D,Z,V,W,A
..............................
5)
R
.............................................
(b) Latched data can be cleared
in
either of the following
two
methods.
1) Using the RUN switch
a) Turn the RUN switch from the STOP position to the
L.CLR position three times.
b)
The RUN LED starts flashing. This indicates that the
latched data is ready to be cleared.
c) Turn the RUN switch from the STOP position to the
L.CLR position while the RUN LED is flashing; the
latched data is cleared.
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I
POINT
1
To
cancel the data latch clear operation, turn the RUN
switch
to
the RUN or
RESET
position while latch clear
operation
is
being attempted.
(a) 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.
The A2CCPU
is
reset.
(b)
RESET
position
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
LI
4-2
1
18
(NAI
66238A
.-
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