With the development of society and progress.
More and more vehicles on the road.
And the road construction is often can't keep up with the speed of urban development.
Therefore, urban traffic problem increasingly prominent.
Often take place such as traffic jam at the crossroads.
At this time, the normal operation of the road traffic lights, and the function of the reasonable is important to ensure smooth traffic.
The previous traffic lights are mostly adopts relay or single chip microcomputer to realize.
There is a little function.
Disadvantages such as large amount of maintenance, and PIE simple programming.
Easy to maintain.
Can change program with different situations need to be flexible in order to realize the different functional requirements.
And high reliability.
Good cost performance, the most important is PIE is very suitable to control the traffic lights such sequential control system.
So in this paper, we design a control city intersection traffic light control system with PLC controller
The traffic light system composed of things and the direction of the south and north four lights.
In each direction of 9 lamp is divided into three groups.
Were straight, left, right red yellow green three colors of light.
Particular case diagram are shown in figure 1 below: control requirements description after press the start button.
The direction of the north and south, east and west four right and remain green light has been lighted.
North and south direction straight green light at the same time.
Other light all bright red light.
The north and the south straight green light flash for 2 seconds after 10 seconds (
Period of 1 second.
The following as flashing cycle is 1 second)
And then a green light, yellow light, 3 seconds after the north and south straight yellow lights went out.
The red light.
What direction left green light at the same time, the other light is still red light, in the same way.
Things left green light to flash for 2 seconds after 10 seconds, and then a green light yellow lights for 3 seconds.
Then yellow red lights went out, and at the same time things straight green light, the other on the red light, things went green light flash for 2 seconds after 10 seconds, and then a green light yellow lights for 3 seconds.
And yellow lights turns red, the left line of green light at the same time, the other on the red light.
Green light flash for 2 seconds after 10 seconds, and then a green light out the yellow lights for 3 seconds, then yellow lights red light, the green light down at the same time.
For other signal light red light, so on and so on.
In order to facilitate programming.
Changes will each lamp list are shown in table 1 below, '0' in table red light, green light '1' said, '2' said yellow lights for 3 seconds, '1' to '2' in the process of the green light to 10 seconds to flash for 2 seconds.
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