1. EL C Co ncep ts
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Example 10 - Flashing Circuit
The ladder diagram uses two timers to form an oscillating circuit which enables a flashing indicator
or a buzzing alarm. n1 and n2 refer to the set values in T1 and T2 and T refers to timer resolution.
T2
TMR
Kn2
T1
X0
TMR
Y1
T2
T1
Kn1
X0
T1
Y1
T
n1
X0
T
n2
Example 11 - Trigger Circuit
In this diagram, rising-edge contact X0 generates trigger pulses to control two actions executing
interchangeably.
Y1
M0
X0
Y1
Y1
M0
M0
X0
M0
Y1
T
Example 12 – OFF Delay Circuit
If X0 = ON, timer T10 is not energized but coil Y1 is ON. When X0 is OFF, T10 is activated. After
100 seconds (K1000 × 0.1 sec = 100 sec), NC contact T10 is ON to turn off Y1. Turn-off action is
delayed for 100 seconds by this OFF delay circuit.
T10
X0
TMR
Y1
T10
K1000
Timer Resolution: 0.1 sec
X0
Y1
100 seconds
Example 13 - Output delay circuit
The output delay circuit is composed of two timers. If input X0 is ON or OFF, output Y4 will be
delayed.
T5
T5
TMR
Y4
T6
X0
K50
Y4
T6
Y4
TMR
X0
K30
3 secs
5 secs
T5
T6
T
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