Monitoring system for oil and gas long-distance Pipeline based on PLC and PROFIBUS field bus

In accordance with the actual demands of monitoring system for oil and gas pipeline, for instance, long transportation distance and many distributed stations, a kind of monitoring system based on the S7-400 series PLC and PROFIBUS field bus was designed and realized in this article. It has the characteristics of the following: supporting multi-master station, excellent real time, high reliability, high transmission rate and long transmission distance. Meanwhile, the construction process of the system was discussed from three aspects: system design, development of controll configuration software and monitoring software. This monitoring system adopts the modes of centralized monitoring and distributed control and has been applied in CNPC West Pipeline, and the result proves this system can realize the above functions and run stably.