【正文】
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Supervise and control an exportation electric current of change the Pin machine value at any time in the Pu the spirit of the whole period, make it not exceed change the sum of Pin machine settle a meet a surprised circumstance to make to output electric current exceed when the sum settle value, immediately lower breeze machine to turn the breeze machine turns to soon decline to allow of lowest turn soon, output electric current to return exceed the sum settle a value, then stop breeze machine and send out to report to the police signal in the meantime Along with automatic control technical development, the UNITANK craft more and more gets extensively experience as principle currently, use DO, time, discharge as a craft control parameter, adjust the Pu spirit circulate of machine and line up mire the etc. lack accurate mathematics model to carry out the automatic control of higher layer of SBR method for once put forward took the COD or the do as parameter of misty control of research direction of the automatic control of SBR method mainly is to look for several control parameters from now on, since can reflect into water of fluid matter water quantity variety and reaction process in of decline a solution circumstance, and then can do for the calculator control parameter. The PLC gathers in proper order control and process to control at the integral whole and have dependable sex Gao, usage convenience, vivid, set simple of the characteristics be the emollient tool of the small scale industrial automation in the the wastewater treatment, according to PLC control system at solid sex, credibility, accurate sex etc. dint a but satisfied a design a request, promised wastewater treatment of smoothly progress. Because of Inter fast development, hope can e to visit to ask wastewater treatment factory through an Inter of from control system, the Inter which needed to input user39。In the meantime, the PLC passes MB+ upward the machine return to various data, place of honor machine logarithms according to carry on an operation processing, show various signal and print various statement. 2 The design of PLC control program The system has four kinds of control methods:The native hand moves a control, single set equipments point moves a control, bee a set, the equipments automatically controls, the whole factory equipments fullautomatic kinds of e