【正文】 單、投資少、網(wǎng)絡(luò)速度快、通信穩(wěn)定性強(qiáng)等特點(diǎn)，它使計(jì)算機(jī)、控制器和其他數(shù)據(jù)源通過(guò)使用雙絞線或光纜在整個(gè)網(wǎng)絡(luò)上作為同位體進(jìn)行通信。因此， 供電系統(tǒng) 中用到的 PLC 選用施耐德的 Modicon Ouantum 系列。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。 PLC3 本地控制站控制 SBR 生物處理部分 .另外，在現(xiàn)場(chǎng)本地控制站各設(shè) 1 臺(tái)操作終端設(shè)各，負(fù)責(zé)在本地對(duì)現(xiàn)場(chǎng)設(shè)各的控制 (自動(dòng)控制、點(diǎn)動(dòng)控制 )。 PLC1 本地控制站控制格柵、 供電 提升泵房、曝氣沉砂池等預(yù)處理部分。同時(shí)上位機(jī) 2 兼做編程器 .中控室另設(shè)置一個(gè)鑲嵌式模擬屏，由上位機(jī) 1 控制，用以直觀顯示全廠工藝流程及主要參數(shù)值。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(lái)， 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)。同時(shí)，也使得控制危險(xiǎn)分散，提高系統(tǒng)可靠性。模擬屏、上位機(jī)、集線器、打印機(jī)位于中控室，二臺(tái) PLC 位于控制現(xiàn)場(chǎng)。銀川市第一 供電系統(tǒng) 廠采用了 SBR 工藝及以 PLC 為核心的控制系統(tǒng)，日處理 供電 10 x 104 t 處理后的達(dá)標(biāo) 供電 可用于農(nóng)業(yè)灌溉。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(lái)的一種新型、通用的自動(dòng)控制裝置。國(guó)內(nèi)外許多 供電系統(tǒng)廠采用了現(xiàn)代先進(jìn)控制技術(shù)和計(jì)算機(jī)技術(shù)，從而構(gòu)成計(jì)算機(jī)監(jiān)督、控制、管理系統(tǒng) .使系統(tǒng)優(yōu)化運(yùn)行。整個(gè)控制系統(tǒng)成功地解決了 PLC 在 供電系統(tǒng) 中的自動(dòng)化控制問(wèn)題，提高了 供電系統(tǒng) 設(shè)備運(yùn)行效率和管理水平。 PLC 本地站負(fù)責(zé)對(duì)具體的工藝、設(shè)備、主要被控參數(shù)進(jìn)行控制及采集各種運(yùn)行數(shù)據(jù)，程序設(shè)計(jì)采用具有在線跟蹤和離線仿真功能的Concept 2. 2XL 軟件。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。s interface, and have online follow and offline imitate true control procedure of PLC3 stationses is divided into five procedure mold piece. （ 1） Public mold pieces of procedure useinclude a beginning to start to turn part, hour cent second etc. ask pulse unit, SBR to respond a period enactment, fuse oxygen enactment...etc.. （ 2） Order control mold pieces of the switch quantity the coordination control report to the police of circulate and related breakdown of equipmentses, such as each valve, pump and breeze machine...etc.. The enter of SBR pond spirit valve, enter water valve, reflux pump, surplus dirty mire pump from PLC according to the craft of the wastewater treatment period time segment control, water valve from PLC according to craft time and super voice liquid the measured value of the instrument to control. （ 3） Protection mold pieces of the offpowersystem power failure after, the PLC saves all appearance locks and make after treating to add an electricity PLC instauration keep of the appearance continue to circulate. （ 4） Mold pieces of correspondences use to plete PLC and various data transmission of place of honor machine. （ 5） Fuse an oxygen value to automatically regulate a mold pieceaccording to fuse an oxygen value to regulate breeze machine to turn soon and report to the police of related target which regulates to turn soon promises the be worth of deliquescence oxygen as 2 mgs/L in the whole Pu spirit control strategy is as follows:The Pu spirit period beginning, the breeze machine at top speed movement attains a 2 mgs/L in shorterly of the hour ask by making deliquescence oxygen and take 5 mins as a period to examine deliquescence oxygen to be worth in the fuse an oxygen value big at the 2 mgs/L, the breeze machine turns to soon descend 5%。t need to operate a personnel an spot data spreads a highest machine through a PLC, e out in the place of honor on board description and make the craft, equipments movement of whole factorieses get an overall control. 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%。s etc. imitate quantity, from to in response to of an appearance spread a feeling machine or change to send to a machine examination to e out and change into the electric current signal of the 4~20 mA, through shield inside the PLC that the electric cable sends to each statures system, from the PLC picks up a people through various mold piece sample telemunication , imitate quantity control the signal send to performance anization by the 4~20 mA electric current form after being output by the PLC, control performance anization of action. The Modicon Quantum series PLC of Schneider pany is satisfy liberal of, according to standard of work conjunction and the spot total line conjunction etc. application the technique provided various work a choice, support Modbus, Modbus Plus(MB+), the long range I/0, TCP/IP etc. work conjunctio