Traffic signal light PLC control program design and debugging - Database & Sql Blog Articles
Control requirements: After the switch is closed, the green light of the east and west lights will flash 2s after 4s; the yellow light will be 2s off; the red light will be 8s; the green light will be on, and the green and yellow lights will be on for 8s when the green light is on, then the green light will be on after 4s. Off; after the yellow light is on for 2s, the red light is on again.
Traffic light experiment board
1), I / O allocation
input Output
X0-------Start button Y0-------North-South green light
X2------- stop button Y1------- east yellow light
Y2-------South-North red light
Y3------- East Green Light
Y4-------South-North Yellow Light
Y5------- thing red light
2), the ladder input program shown below
3), debug and run the program
4), programming exercises
Add manual control based on Content 1. Whenever you enter the point X1 switch teaching
Process: When S2 is closed, the north and south green lights are on, and the red light is on. When S2 is turned on and the X2 switch S3 of the input point is closed, the green light of the east and west lights, and the red light is bright. Program the program and run it on the machine.
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