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The living creature processing part of the PLC3 station control is the whole wastewater treatment of key part, be limited by space, only with the PLC3 stand of program design for example. 2． 1 Process of control The PLC3 stationses were use to control to get into Pu spirit from sewage, the pond is everywhere sewage run off Pu after manage spirit the whole process of the turn of sequence and time switch moderate breezes machine of control various valve, pump, breeze machine to soon regulate etc. in this Pu spirit pond is the core of wastewater treatment to construct a thing, sewage is to e and go through a microbial living creature oxygenation in the pond in addition to anic matter, the processing effect of content to sewage of the oxygen in water is to go to a pass according to the SBR craft, the deliquescence oxygen in the Pu spirit pond content usually controls within the scope of 1~3 mgs/L and annoy a stage end to fuse an oxygen content in the Pu should be not over the 2 mgs/ the oxygen once measured low or lead Gao, all will influence a fluid matter 4 sets of the 10 104 t the SBR of 8 pond modes to respond pond to the day, each one responds that the pond go together with a pedestal from change Pin machine control of breeze machine, used for annoying pond Pu spirit to by turn provide oxygen toward two 4 pieces of deliquescence oxygen test instruments in the different location of each Pu spirit pond, measure contain of sewage amount of oxygen in pond, the PLC separates a 5 mins to examine a deliquescence oxygen in a Pu spirit pond value each time, according to fuse oxygen of average value to control breeze machine to turn fuse oxygen low limit at the bottom of the enactment, the frequency modulation breeze machine turns to soon increase 5%。 the long 一 distance control and monitoring of field equipment are uncharged of the upper puter。When fuse an oxygen value small at the 2 mgs/L, the breeze machine turns to soon rise 5%.If the breeze machine turns to soon rise to allow of tallest turn soon, fuse an oxygen value return small then maintain tallest to turn soon at the 2 mgs/ kind of circumstance may annoy the last phase of period to appear in the Pu, but also will not clearly influence wastewater treatment quality. 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 ind