Tag Archives: traffic light ladder diagram plc

PLC control ladder design of traffic lights

There are three red, yellow and green signal lights in the north and south of the intersection, and the six lights reciprocate in a certain time sequence.

North-south direction

North and South Green (8s), East and West (8s)

North and South Yellow (2.1s), East and West (2.1s),

North and South Red (10.1s), East Green (8s), East Yellow (2.1s)

East-west direction

East-West Red (10.1s), North-South Green (8s), North-South Yellow (2.1s)

East Green (8s), North and South Red (8s)

East and West Yellow (2.1s), North and South Red (2.1s)

X000——Start and cycle starting point, north and south green, east and west red.

Y000——North-South green output

Y001——North-South yellow output

Y002——East red output

Y003——East-West green output

Y004——East-West yellow output

Y005——North-South red output

M0——The intermediate relay keeps the state of X000.

T0——East red timing

T1——East and West Green Timing

T2——East and West timing

T3——North-South Green Timing

T4——North and South yellow timing

T5——North and South Red Timing

plc programming examples

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Mitsubishi FX PLC Crosswalk Programming Ladder Diagram

This is a Mitsubishi fx Series PLC program using Ladder Diagram to control traffic lights programming examples

  1.Crosswalk button


When the crosswalk button is pressed, the sequence changes traffic lights. If the traffic light has entered the operational changes, the button will not work.


Timing diagram


Ladder Diagram


Instruction List