beautypg.com

Delta DVP-ES2 User Manual

Page 27

background image

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

This manual is related to the following products: