Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Green light Blinking, Timing Diagram, SFC Figure

1. PLC Concepts

Example 16 - Traffic light control (Step Ladder Logic) Traffic light control

	Red light	Yellow light
Vertical light	Y0	Y1
Horizontal light	Y20	Y21
Light Time	35 Sec	5 Sec

Vertical

Light

Horizontal

Light

Green light

Y2

Y22

25 Sec

Green light

blinking

Y2

Y22

5 Sec

Timing Diagram:

Vertical

Light

Red Y0
Yellow Y1
Green Y2				25 Sec
Horizontal					5 Sec 5 Sec
Light
Red Y20
Yellow Y21
Green Y22
	25 Sec
		5 Sec	5 Sec

SFC Figure:

M1002

S0

S20		Y0			S30
T0		TMR	T0	K350	T10
S21		Y2			S31
T1		TMR	T1	K250	T11
S22		TMR	T2	K50	S32
	M1013		Y2
T2					T12
S23			Y1		S33

T13

S0

Y22

TMR T10 K250

TMR T11 K50

M1013

Y22

Y21

TMR T12 K50

Y20

TMR T13 K350

1 - 2 1