Automatic Control System Based On Profibus For Swage Treatment

Although a swage treatment system has great social benefit, it's a fact that the cost is high, and the economic benefit is low. It's necessary to apply the computer control technology for semi-automatic or full-automatic control on the process of swage treatment.Considering the actual control requirement in a sewage work, this paper compares and analyzes several industry network patterns in a integrated automatic system' s integrality, reliability, extendibility and open capability, and brings forward a communication network scheme, which is based on PROFIBUS field bus . It also offers the network's constituent parts, the steps of setting the network, and the main parts of communication program .There are many difficulties in a aeration tank control, such as intermittence, non-linearity, delay ,and the direct control variable is hard to be online measured. This paper compares the results of respectively applying PID, SMITH, FUZZY strategy using of MATLAB emulation toolbox. The fuzzy strategy gets a good result, and it needn't a correct model, so it is chose and implemented by a table look-up program. Because FID is simple, convenient to use,and it's the most basic way in industry process control ,a new idea is suggested that combining FID and FUZZY, making the control variables of PID beonline self-setting.In view of the high-power equipments, the local control stations's designs adopt frequency changer and soft motor starter to save energy and protect equipments.