Description: Traffic lights at the crossroads of the design report of the curriculum design is the use of PLC programming, use of the learned the basic commands and a simple typical circuit, including the direction of a variety of timing circuits, blinking circuit, the opening of the control circuits, alarm circuits, extinguished delay circuit, such as basic modules, to achieve a simulation of the control of traffic lights, and when in the event of failure to eliminate clearance system and a warning signal, a certain real value of
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