Delta DVP-ES2 User Manual download pdf (Page 29)

1. PLC Concepts

1-21

Example 16 - Traffic light control (Step Ladder Logic)

Traffic light control

Red light Yellow light Green light

Green light

blinking

Vertical light Y0 Y1 Y2 Y2

Horizontal light Y20 Y21 Y22 Y22

Light Time 35 Sec 5 Sec 25 Sec 5 Sec

Vertical

Light

Horizontal

Light

Timing Diagram:

5 Sec

Y0

Y1

Y2

Y20

Y21

Y22

Vertical

Light

Red

Yell ow

Green

Horizontal

Light

Red

Yellow

Green

5 Sec

25 Sec

5 Sec5 Sec

25 Sec

SFC Figure:

S0

S20

S21

S22

S0

M1002

T0

T1

T13

Y0

S23

T2

TMR T0 K350

Y2

TMR T1 K250

Y2

TMR T2 K50

M1013

Y1

S30

S31

S32

T10

T11

S33

T12

Y22

TMR T10 K250

Y21

TMR T12 K50

Y22

TMR T11 K50

M1013

Y20

TMR T13 K350

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