b.
r
L
r
L
c
L
c
P
L.
r"
L
LL.
L
4.
AXCPU
/MELSEC-A
Instruction code check
I
I
At
an
execution of each
individual instruction
CPU error
Parameter setting
check
No END instruction
Instruction
not executable
RAM
check
When power
io
turned ON or
l1
When A2C status
io
changed
A2C
io
reset.
from STOPPAUSE to RUN.
When A2C status is changed
from STOPPAUSE to RUN.
When following instructions
12
are executed:
When A2C status is changed
When power is turned ON or
A2C
is reset.
Operation circuit
A2C is reset.
check
When power is turned ON or
21
Watchdog timer error
I
22
I
At an execution
of
END in-
struction
END instruction
Always 25
Infinite loop execution
struction
not executed
At an execution
of
END in-
24
Battery
Low battery voltage
*'
1
70
I
*Always
I
I
Operation check error
At
an
execution of each indi-
'2
I
50
I
vidual instruction
1
T.bk
4.7
Sotfakqnorh
Lid
Ax
RUN
LEO
St8tUr
status
Stop
Flickers
Run
I
Lit
ERROR
ED8t.tu
Lit
Lit
1. If
two
status is given
in
the
'A2C
Status" and "RUN LED Status" columns,
status
retting
can be selected by the setting
on
a
peripheral device.
2.
*l
......
Low battery voltage state can
be
detected by reading the setheset state
of the low battery flag
(MSOOS)
or low battery latch flag
(M9007).
(For the low battery flng and low battery latch
flag,
888
Appendix 2.)
3.
*2
-....-
The operation check error can be detected by reading the set/reset
status
of
the operation error flag (M9010, M9011). By reading the error
step registers (D9010, DWll), the number of the step causing
the
operation error can
be
confirmed.
(For the operation error flag, see Appendix 2 and for the error step
register, see Appendix
3.)
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