【正文】 quipments 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。s name and password and then can carry out long range came to carried on a control to the equipments of whole the sewage data of wastewater treatment factory to the national environmental protection bureau through an Inter in the meantime city environmental protection bureau perhaps, for the purpose of the Bu class management of section to wastewater treatment factory. 基于 PLC 的控制系統(tǒng)在 供電系統(tǒng) 中的應(yīng)用 介紹了以 PLC 為核心的分布式控制系統(tǒng)在 供電系統(tǒng) 系統(tǒng)中的應(yīng)用。綜合了計(jì)算機(jī)技術(shù)自動(dòng)控制技術(shù)和通信技術(shù)而發(fā)展起來的一種新型、通用的自動(dòng)控制裝置。上位機(jī)負(fù)責(zé)現(xiàn)場(chǎng)設(shè)各的遠(yuǎn)程控制 (全自動(dòng)控制、自動(dòng)控制、點(diǎn)動(dòng)控制 )和監(jiān)視，利用 Intouch7. 0 工程軟件包提供良好的人機(jī)對(duì)話界而，以查詢方式從 PLC 獲取有關(guān)參數(shù)和設(shè)備狀態(tài)信息，以棒圖形式在 CRT 上直觀顯示出來， 同時(shí)打印必要的數(shù)據(jù)，供主控及管理人員指導(dǎo)生產(chǎn)。同樣，模擬量控 制信號(hào)由 PLC 輸出后以 4～ 20mA 電流形式送到執(zhí)行機(jī)構(gòu)，控制執(zhí)行機(jī)構(gòu)的動(dòng)作。前二種方式一般只在設(shè)各調(diào)試或維修時(shí)使用，系統(tǒng)主要以全自動(dòng)控制方式運(yùn)行。在每個(gè)曝氣池的不同地點(diǎn)設(shè) 4 塊溶解氧測(cè)試儀，測(cè)量池中 供電 的含氧量， PLC 每隔 5 min 檢測(cè)一次曝氣池內(nèi)的溶解氧值，根據(jù)溶解氧的平均值來控制風(fēng)機(jī)轉(zhuǎn)速。 （ 3）斷電保護(hù)模塊 ——系統(tǒng)斷電后， PLC 將所有狀態(tài)鎖存，待加電后使 PLC恢復(fù)所保持的狀態(tài)繼續(xù)運(yùn)行。如果風(fēng)機(jī)轉(zhuǎn)速降到允許的最低轉(zhuǎn)速時(shí)，輸出電流還超過額定值，則停風(fēng)機(jī)，同時(shí)發(fā)出報(bào)警信號(hào)。同時(shí)通過 Inter 將 供電系統(tǒng) 廠的 供電 數(shù)據(jù)輸送到國(guó)家環(huán)?？偩只蛘呤协h(huán)保局，以便卜級(jí)部門對(duì) 供電系統(tǒng) 廠的管理。ksv*3t nGK8!z89Am YWpazadNuKNamp。 ksv*3t nGK8! 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