Along with the development of the ages, the technique that is nowadays is also gradually perfect, the competition plays more and more strong; the operation that list depends the artificial has already can't satisfied with the current manufacturing industry foreground, also can't guarantee the request of the higher quantity and high new the image of the technique business enterprise.
The people see in produce practice, automate brought the tremendous convenience and the product quantities for people up of assurance, also eased the personnel's labor strength, reduce the establishment on the personnel. The target control of the hard realization in many complicated production lines, whole and excellent turn, the best decision etc., well-trained operation work, technical personnel or expert, governor but can judge and operate easily, can acquire the satisfied result. The research target of the artificial intelligence makes use of the calculator exactly to carry out, imitate these intelligences behavior, moderating the work through person's brain and calculators, with the mode that person's machine combine, for resolve the very complicated problem to look for the best path
We come in sight of the control that links after the electric appliances in various situation, that is already the that time generation past, now of after use in the mold a perhaps simple equipments of grass-roots control that the electric appliances can do for the low level only And the PLC emergence also became the epoch-making topic, adding the vivid software control through a very and stable hardware, making the automation head for the new high tide.
The PLC biggest characteristics lie in: The electrical engineering teacher already no longer electric hardware up too many calculationses of cost, as long as order the importation that the button switch or the importation of the sensors order to link the PLC up can solve problem, pass to output to order the conjunction contact machine or control the start equipments of the big power after the electric appliances, but the exportation equipments direct conjunction of the small power can.
隨著時代的發(fā)展,當(dāng)今的技術(shù)也日趨完善、競爭愈演愈烈;單靠人工的操作已不能滿足于目前的制造業(yè)前景,也無法保證更高質(zhì)量的要求和高新技術(shù)企業(yè)的形象.
人們在生產(chǎn)實踐中看到,自動化給人們帶來了極大的便利和產(chǎn)品質(zhì)量上的保證,同時也減輕了人員的勞動強(qiáng)度,減少了人員上的編制.在許多復(fù)雜的生產(chǎn)過程中難以實現(xiàn)的目標(biāo)控制、整體優(yōu)化、最佳決策等,熟練的操作工、技術(shù)人員或?qū)＜摇⒐芾碚邊s能夠容易判斷和操作,可以獲得滿意的效果.人工智能的研究目標(biāo)正是利用計算機(jī)來實現(xiàn)、模擬這些智能行為,通過人腦與計算機(jī)協(xié)調(diào)工作,以人機(jī)結(jié)合的模式,為解決十分復(fù)雜的問題尋找最佳的途徑。
我們在各種場合看到了繼電器連接的控制，那已經(jīng)是時代的過去，如今的繼電器只能作為低端的基層控制模塊或者簡單的設(shè)備中使用到；而PLC的出現(xiàn)也成為了劃時代的主題，通過極其穩(wěn)定的硬件穿插靈活的軟件控制，使得自動化走向了新的高潮。
PLC的最大特點(diǎn)在于：電氣工程師已不再電氣的硬件上花費(fèi)太多的心計，只要將按鈕開關(guān)或感應(yīng)器的輸入點(diǎn)連接到PLC的輸入點(diǎn)上就能解決問題，通過輸出點(diǎn)連接接觸器或繼電器來控制大功率的啟動設(shè)備，而小功率的輸出設(shè)備直接連接就可以。
PLC的內(nèi)部包含了具有中央處理器的CPU，并帶有外部I/O口擴(kuò)展的I/O接口地址和存儲器三大塊組成，CPU的核心是由一個或者多個累加器組成，它們具有邏輯的數(shù)學(xué)運(yùn)算能力，并能讀取程序存儲器的內(nèi)容通過計算后去驅(qū)動相應(yīng)的存儲器和I/O接口；I/O口將內(nèi)部累加器和外部的輸入和輸出系統(tǒng)連接起來，并將相關(guān)的數(shù)據(jù)存入程序存儲器或者數(shù)據(jù)存儲器中；存儲器可以將I/O口輸入的數(shù)據(jù)存入存儲器中，并在工作時調(diào)轉(zhuǎn)到累加器和I/O接口上，存儲器分程序存儲器ROM和數(shù)據(jù)存儲器RAM,ROM可以將數(shù)據(jù)永久的存入存儲器中，而RAM只能作為CPU計算時臨時計算使用的緩沖空間。
PLC的抗干擾是極其優(yōu)秀的，我們根本不用去關(guān)心它的使用壽命和工作場合的惡劣，這些所有的問題已不再成為我們失敗的主題，而留給我們的是關(guān)心如何來利用PLC的內(nèi)部資源