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FX Series Programmable Controllers Devices in Detail 4
4-9
4.4.4 Annunciator Flags
Some state fla
g
s can be used as outputs for external dia
g
nosis (called annunciation) when
certain applied instructions are used. These instructions are;
ANS function 46: ANnunciator Set - see pa
g
e 5-47
ANR function 47: ANnunciator Reset - see pa
g
e 5-47
When the annunciator function is used the controlled state fla
g
s are in the ran
g
e S900 to S999
(100 points). B
y
pro
g
rammin
g
an external dia
g
nosis circuit as shown below, and monitorin
g
special data re
g
ister D8049, the lowest activated state from the annunciator ran
g
e will be
displa
y
ed.
Each of the states can be assi
g
ned to si
g
nif
y
an error or fault condition. As a fault occurs the
associated state is driven ON. If more than one fault occurs simultaneousl
y
, the lowest fault
number will be displa
y
ed. When the active fault is cleared the next lowest fault will then be
processed.
This means that for a correctl
y
prioritized dia
g
nostic s
y
stem the most dan
g
erous or dama
g
in
g
faults should activate the lowest state fla
g
s, from the annunciator ran
g
e. All state fla
g
s used for
the annunciator function fall in the ran
g
e of batter
y
backed/ latched state re
g
isters.
Monitorin
g
is enabled b
y
drivin
g
special auxiliar
y
rela
y
M8049 ON.
State S900 is activated if input X0 is not driven
within one second after the output Y0 has been
turned ON.
State S901 is activated when both inputs X1 and
X2 are OFF for more than two seconds.
If the c
y
cle time of the controlled machine is less
than ten seconds, and input X3 sta
y
s ON, state
S902 will be set ON if X4 is not activated within
this machine c
y
cle time.
If an
y
state from S900 to S999 is activated, i.e.
ON, special auxiliar
y
rela
y
M8048 is activated to
turn on failure indicator output Y10.
The states activated b
y
the users error / failure
dia
g
nosis detection pro
g
ram, are turned OFF b
y
activatin
g
input X5. Each time X5 is activated, the
active annunciator states are reset in ascendin
g
order of state numbers.
M8000
Y0 X0
S900K10T0ANS
X1 X2
S901K20T1ANS
X3 X4
S902K100T2ANS
FNC46
FNC46
FNC46
M8048
X5
ANR (P)
FNC47
Y10
M8049