Design and Analysis of Multi-state Supervisory System of Freeway Tunnels Based on PHOENIX Programming Logic Controller

Taking the PHOENIX PLC made in Germany as the core of multi-state supervisory of the freeway tunnel,the control of various control objects and the transmittion of data are carried out.According to the practical demands,the control model of each control object is designed.The programming is achieved to meet the requirements in programming interface PCWORX.Through the in site test,the programming controller(PLC) works stably.The whole system has a reliable performance.It isproved that the tunnel monitoring system has overcome the past inconveniences.The flexibility and practicability of PHOENIX PLC are proved in the multi-state supervisory system of freeway tunnels.