Delta DVP-ES2 User Manual
Page 27
1 . P L C C o n c e p ts
1 - 1 9
Example 9 – Oscillating Circuit with Timer
An oscillating circuit with cycle nT+ΔT
T0
X0
TMR
Y1
Y1
T0
Kn
Y1
T
T
n
X0
When X0 = ON, T0 starts timing (nT). Once the set time is reached, contact T0 = ON to enable
Y1(ΔT). In next scan, Timer T0 is reset due to the reversed status of contact Y1. Therefore contact
T0 is reset and Y1 = OFF. In next scan, T0 starts timing again. The process forms an oscillating
circuit with output cycle nT+ΔT.
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 - Delay OFF 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 delay OFF circuit.
T10
X0
TMR
Y1
T10
K1000
Timer Resolution: 0.1 sec
X0
Y1
100 seconds