交通信号PLC控制触摸屏动态显示系统

Based programmable logic controller –PLC and touch panel, the paper has designed a dynamic display system for urban road traffic signal. The feature of the system are combining PLC with touch panel, adopting PLC to control traffic signal and displaying traffic signal live states on touch panel and changing signal timing parameters on line. The system can realize traffic signal control to signalized intersection with difference signal phase and coordinated control of traffic signals. The paper has introduced the design procedure of system, and has expounded the design steps of PLC control program and the making method of touch panel interface and then gives the typical subprogram. The system here has been running successfully and has used in self-designed traffic signal PLC control system.