【正文】 ntroled parameter to carry on control and collect various movement data, the program design adoption have online follow with offline imitate the Concept of true function 2. 2 XL of honor machine and of the PLC adoption set the be quickly simple and circulate speed, correspond by letter the stability strong MB+ whole control system successfully solved the PLC controls a problem in the automation within wastewater treatment and raised a wastewater treatment equipments to circulate an efficiency and manage level. Recently, for carrying out high quality, low consume, stable dependable and international many wastewater treatment factorieses adopted a modern forerunner to control technique and calculator technique and constitute calculator direct, control thus, manage system excellent to turn the programmable logic controller(PLC) then take microprocessor as the calculator technique automatically controls technique and correspondence technique but develops of a kind of new and in general use utomatic control structure simple, function superior, dependable sex Gao, work properly words in general use, be easy to plait distance, usage convenience etc. advantage etc..The silver Chuan City the first wastewater treatment factory adopted a SBR craft and take PLC as the control system of core, day after handling the sewage 10 104 t the processing of reach mark sewage can used for an agriculture irrigation. 1 Control system structure Control the way of concentration monitor management, scatter a control of the system emulation hold, place of honor machine, gather a line machine, printer to Be located on medium control room, two set PLCs are located on control the this kind of structure can make the information in the production line can centralized management with carry out whole operation, management with excellent make to control dangerous dispersion in the meantime, raise the system credibility. 1． 1 The upper puters Medium control two calculator adoption PII class works of room to control machine, circulate the operate system of Windows place of honor machine be responsible for on the scene establish each long range control(fullautomatic control, automatic control, order to move a control) with surveillance, make use of Intouch7. 0 engineering software packages provide a good person machine dialogue boundary but obtain concerning parameter and equipments appearance information from the PLC by searching a way, keep a view manifestation to e out on the CRT by good sketch type, print a necessary data in the meantime and be provided for lord to control and manager instruction and control boundary but include the system total diagram, system cent diagram, imitate the quantity general chart, parameter a constitution, report to the police a window, history trend and register a window etc. boundary the system total diagram, circulate the personnel can keep watch on signals, such as all movement appearances, equipments trouble and liquid which control an equipments and discharge...etc..Operate a personnel in the system the cent the diagram can carry on a single machine point to move to circulate an operation to all control equipmentses, bee the set automatically circulate operation or the whole factorieses fullautomatic operation bine the meantime place of honor machine 2 and do a plait distance a control room to establish another an inset type emulation to hold, is been one control by the place of honor machine, in order to keep the craft process of the view manifestation whole factory and main parameter value. 1． 2 The PLC stand According to wastewater treatment of two part, the spot the long range of the equipments the control output and the spot the signal collect to control a station pletion from two PLC wood native control station control the space grid, sewage promote a pump house, Pu spirit to sink sand pond39。上位機(jī)與 PLC 之間采用組網(wǎng)簡單、運(yùn)行速度快、通信穩(wěn)定性強(qiáng)的 MB+網(wǎng) 。 PLC 站 根據(jù) 供電系統(tǒng) 的二部分，現(xiàn)場設(shè)備的遠(yuǎn)程控制輸出和現(xiàn)場信號(hào) 采集由二個(gè)PLC 木地控制站完成。 控制過程 PLC3 站用來控制從 供電 進(jìn)入曝氣池到處理后的 供電 流出曝氣池的整個(gè)過程。調(diào)節(jié)轉(zhuǎn)速的目標(biāo)是在整個(gè)曝氣周期中，保證溶解氧的值為 2 mg/控制策略如下：曝氣周期開始，風(fēng)機(jī)以全速運(yùn)行，以使溶解氧在較短的時(shí)問內(nèi)達(dá)到 2 mg/L，同時(shí)以 5 min 為周期檢測溶解氧值。 QA9wkxFyeQ^! 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