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DVP-ES2-EX2-SS2-SA2-SX2-Operation Manual

DVP-ES2-EX2-SS2-SA2-SX2-Operation Manual

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1. PLC Concepts<br />

Example 16 - Traffic light control (Step Ladder Logic)<br />

Traffic light control<br />

Red light Yellow light Green light<br />

Green light<br />

blinking<br />

Vertical light Y0 Y1 Y2 Y2<br />

Horizontal light Y20 Y21 Y22 Y22<br />

Light Time 35 Sec 5 Sec 25 Sec 5 Sec<br />

Vertical<br />

Light<br />

Horizontal<br />

Light<br />

Timing Diagram:<br />

Vertical<br />

Light<br />

Red Y0<br />

Yellow Y1<br />

Green Y2<br />

25 Sec<br />

Horizontal<br />

Light<br />

5 Sec<br />

5 Sec<br />

Red Y20<br />

Yellow Y21<br />

Green Y22<br />

25 Sec<br />

5 Sec<br />

5 Sec<br />

SFC Figure:<br />

M1002<br />

S0<br />

S20<br />

Y0<br />

S30<br />

Y22<br />

T0<br />

TMR T0 K350<br />

T10<br />

TMR T10 K250<br />

S21<br />

T1<br />

Y2<br />

TMR T1 K250<br />

S31<br />

T11<br />

TMR T11 K50<br />

M1013<br />

Y22<br />

S22<br />

T2<br />

TMR T2 K50<br />

M1013<br />

Y2<br />

S32<br />

T12<br />

Y21<br />

TMR T12 K50<br />

S23<br />

Y1<br />

S33<br />

Y20<br />

TMR T13 K350<br />

T13<br />

S0<br />

1-21

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