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Abstract
Because big control hysteresis and complicated ponderance of PAC in the technique of tap water, the conventional control ¡ª¡ªPID is not really realization auto control the quantity of PAC. This paper analyzes the emphases and difficulty of the system of add PAC to the waterworks, then put the axe in the helve. In the end, introduce a new application of SIEMENS S7-200 in the system of add PAC to the waterworks.
Key Words: PLC, Tap water, PAC, PID
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