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Fault Detection With Annunciator (f) - Mitsubishi Electric MELSEC-A Series User Manual

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4.A2CCPU
- - - - - - - - - - - - - - - - - - - - MELSEC-A
I
4.3.2
Fault detection with annunciator (F)
An annunciator (F) is used 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 relay (M9009) is turned ON with the number of annunciator
which is turned ON stored in the special register (09009).
(b) Registers 09124 to 09132 store the number of annunciators 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.
-E;;~~;;I;;~--------····-----------······------------····--------
-----~
In the sequence program shown below, M9009 is turned ON when F5 is
turned ON and "5· is stored in 09009.
[Fault detection program]
L.
._ •••
•••
•••
• __ ••••••
• __ ••••••••••
J
f--------1
SET
M9OO9
M9009
I
OFF
~
ON
I
(Annunciator ON detactlon)
09009
O~5
(Number of annunciator
turned ON)
09124
o
~
1
(Number of annunciators
09125
turnad ON)
O~5
09126
(Annunciator numbers
0
are stored In order that
annunciators are turned
09132
0
ON. (up to 8))
(1) Turning ON an annunciator
An OUT instruction (OUT F[ ]) or SET instruction (SET F[ ]) 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 09124 to 09132 do not change if
the annunciator is turned OFF using an OUT instruction.
4-47

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