With the development of urbanization, the problem of urban traffic congestion has attracted more and more attention, and traffic congestion has become a major problem restricting urban development. It can be seen that improving traffic light control systems and improving their flexibility and adaptability to realize intelligent traffic guidance is the trend of future development. With the development of industry 4.0 and intelligent automation, programmable control module PLC is widely used in various fields due to its control of the simple, flexible, intelligent, and stable feature.PLC has higher reliability and better stability relative to the embedded controller, and it can collect and extract external signals quickly.

This book is about programming an S7-300 PLC to function as a traffic light controller. This book has been prepared for those who are already familiar with basic PLC instructions and now wish to challenge their knowledge by writing more complex industrial PLC programs. When you either write a PLC program similar to the one defined in the text or read my solutions and understand the code, you will be able to write additional programs with even more complexity on your own. You even can expand these programs to have more features if you wish. PLC programmers must be able to develop logical thinking skills, problem-solving skills, and troubleshooting skills in order to be successful in today's market. Therefore, successfully completing this project verifies that you have taken those steps, fulfilled these requirements, and achieved those goals.

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