The Design And Realization For Automatic Control System Based On Field Bus For The City Sewage Treatment

At present, with the development of technique on computer, correspondence, control network, the control technology has already transited from the collection type control system(DCS) to the field bus control system(FCS), and is gradually substituted by latter. The domain of information communication exchange is covering from the factory scene equipment level to the control, management each level rapidly. It covers from the construction section, the workshop, the factory, the enterprise and even market all the world . The field bus control technology is developing into main part of the 21st century automatic control by its entire digital, the entire disperser, the entire opening characteristic.This article introduces Jiyuan City newly built sewage treatment plant automatic control system production craft and the main equipment mechanical electrical specification. It researches how to use fully the modern control technology, the network technology, the field bus technology, the computer technology, and the intelligent measuring appliance enables the city sewage treatment automatic control system which achieved the international advanced level. The paper had fully considered the factors of cost, maintenance reliability and advanced, proposes a practical plan based on the PROFIBUS field bus sewage treatment automatic control system, designs the constitution of sewage treatment plant automatic control system and the PROFIBUS network's disposing plan.The automatic control system establishes 3 scene PLC monitoring stations and 1 central operating station. The lower position machine system uses PLC, on the position machine system uses PC or IPC (industry PC machine). Considering the sewage treatment controls the request to the system security, the reliability, the maintainability and the flexible. This system's hardware composition is: The scene control station chooses Siemens S7-300 series modular structures PLC, on position machine chooses labor controlling machine IPC.The field bus product chooses Simens the PROFIBUS-DP open style industry field bus. The lower position machine programming adoptes STEP-7 V5.0 software package to design the PLC software. On the position machine programming uses SIMATIC WinCC configuration software.The establishment of high level automation on sewage treatment plant, not only may strengthen the system's reliability, accuracy, but also may reduce the labor intensity,...