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An Introduction to Programming
b Alarm activation delay
Ladder Diagram
M1
18
T1
22
When an alarm is triggered (M1 switches to "1") the 10s delay timer starts. After the 10 seconds
T1 then starts timer T2, which is set to 30 seconds, and the siren activation time begins.
b Alarm display (switch on siren and rotating beacon)
Ladder Diagram
T1
26
T1
29
The siren is activated after the 10s activation delay (T1) and remains on while timer T2 is run-
ning. After the end of the 30s activation period (T2) the siren deactivates. The rotating beacon
is also switched on after the 10s delay. The following illustration shows the signal sequence
generated by this section of the program:
1
M1
0
1
T1
0
1
T2
0
ON
Y1
OFF
ON
Y2
OFF
FX Beginners Manual
T2
10 s
Programming PLC Applications
Instruction List
K100
18 LD
T1
19 OUT
22 LD
K300
23 OUT
T2
Instruction List
26 LD
Y001
27 ANI
28 OUT
Y002
29 LD
30 OUT
30 s
t
M1
T1
K100
T1
T2
K300
T1
T2
Y001
T1
Y002
3 – 25
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