A remote control system on traffic lights based on IEC61131-3 standard language

To achieve the monitoring and control function of traffic signal lights, a system using PLC with Ethernet function as its controller is developed. The local control program is based on IEC61131-3 standard language and the remote control program is based on LabVIEW. OPC Server realizes the data communication between controller and remote control program. This system with web camera installed in the field achieves remote monitoring and controlling of the traffic lights through Internet; the local control program can be modified via Internet; and the traffic signal time sequence can be dynamically controlled. Experiment results show that this system not only has convenient remote monitoring capabilities, but also can implement the remote control functions in complicated road conditions. Furthermore, easy maintenance, low cost and good application value can be reflected in the system.