4.
A2CcPU
/MELSEC-A
4.3.2
Fauk
detection
with
annunciator
(F)
An annunciator
(F)
is used to in
a
user's fault detection program.
If the annunciator
is
turned
ON,
associated control differs from the
control executed when
an
internal relay
(M)
or latch relay
(L)
is
turned
ON.
(a)
If the annunciator is turned ON by
the
sequence program,
the special retay
(M9009)
is turned ON with the number of
annunciator which is turned
ON
stored in
the
special
register
(09009).
(b) Registers
09124
to
D9132
store the number of. annun-
ciators which have been turned
ON
and those annunciator
numbers.
The annunciator number stored in
09125
and that in
09009
are the same number.
By
monitoring
M9009
and
09009
with an annunciator used
in
a
fault detection program,
it
is
possible to check whether
or not an error has occurred and contents of the error.
I
In the sequence program shown below,
M9009
is turned ON when
F5
is
turned
ON
and
"5"
I
I
is
stored in
D9009.
I
[Fault detection program]
I
_t
K4ym,!+-=
091
24
output
of
W12S
D9126
I
annunciator number
-Detection annunciator
ON
I
w132
17-1
(Annunciator
ON
detection)
I
(Number
of
annunciator turned ON)
I
(Numtmr
of
annunciaton turned ON)
I
(Annunciator numbers are
stored
in order
that annunciaton are turned ON. (up
to
8))
I
I
I
I
I
I
L
----------------------
J
(1)
Turning ON an annunciator
An OUT instruction (OUT F[:l) or
SET
instruction (SET
F[:l)
is
used
to
turn
ON
an
annunciator.
(a)
An annunciator can be turned ON/OFF by turning ON/OFF
the input conditions when an OUT instruction
is
used. The
OUT instruction is executed each scan.
Contents in
M9009, 09009,
and
D9124
to
D9132
do not
change if the annunciator
is
turned
OFF
using an OUT
instruction.
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