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Based on the design of Siemens S7-200 traffic control

ABSTRACT

Since the birth of traffic lights, the circuit in its internal control system have

continually been improved, also began to design methods varied, so that traffic lights become more intelligent. In particular, in recent years, with electronics and the rapid development of computer technology, electronic circuit analysis and design methods have greatly improved, electronic design automation has become a modern electronic system in an indispensable tool and means now, PLC today's rapid technological development, has become an increasingly widespread applications in industrial automation position is extremely important, widely used in various industries. With the development of science and technology, programmable controllers improvement of the function, together with the small, low-price, high reliability in the modern industry of a more prominent role, And more traffic control Trend is the development of intelligent, LED traffic lights in the continuing luminescence, rain, dust and other adverse weather conditions, can still maintain good work performance and lower prices. In this paper, Siemens Programmable Logic Controller control traffic through the traffic lights.

Key words: Siemens S7-200, traffic lights, PLC, ladder-diagram.

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