| According to the Sewage Disposal Project for National Electric Power Control Center in Xidan, the paper presents the design of sewage disposal intelligent monitoring and control system based on IPC-PLC, including PLC program control system, computer supervision system and the communication system between the upper and the lower computer, and introduces its hardware configuration and software achievement.In this project, PROFIBUS-DP control system is composed by the lower computer-SIEMENS S7-300 PLC as master station and ET200M distributed I/O device as slave station. With the help of the corresponding programming software STEP7 and the programming language STL and LAD, the lower computer control program is made so that the sewage disposal system-including neutral water, soft water and drinking water- can be automatic controlled according to the technologic requirements.Using the high stabilization and good anti-jamming performance industrial personal computer (IPC) as upper computer, WinCC software, which is also a product from SIEMENS, is used to configure the supervisory software, in order to realize the real-time data-logging, supervising and controlling, as well as various visual HMI such as technologic flow, record checking, alarming, reporting, parameter setting, real-time curving. How to use the Global Script of WinCC to develop the fuzzy self-tuning PID parameters control algorithm is described and the fuzzy self-tuning PID control of pH value was achieved in sewage disposal process.PLC and IPC in the central control room is communicated via Industrial Ethernet based on TCP/IP to form a hybrid industry control system, not only to make profit of the unique merits of PLC and IPC but also to realize integrating management and control of the Control Center by linking the BA together. |
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