7BP706.0端口模塊
PLCOPEN將PLC定義為：具有編程能力的固態(tài)控制系統(tǒng)
PLC主要的功能就是通過編程后實(shí)現(xiàn)用戶需要的各種類型的控制功能，前面已經(jīng)說過在沒有PLC之前，大家要通過很多專用電路或者繼電器組來完成控制功能?，F(xiàn)在PLC廣泛的應(yīng)用于幾乎所有的行業(yè)中，我們身邊的絕大多數(shù)產(chǎn)品都是由PLC控制的裝備制造出來的。比方說塑料、包裝、造紙、冶金、石化、電梯、木工、陶瓷等等。
因?yàn)榭刂频姆绞讲煌?，以前大家分為過程控制和順序控制或者離散控制兩類，其中過程控制來源于早期的過程儀表控制，后逐步發(fā)展為DCS，而順序控制來源于早期的繼電器組，后發(fā)展出了PLC，但隨著微電子、軟件、硬件和通信技術(shù)的發(fā)展，目前很多DCS和PLC都采用同樣的或者類似技術(shù)平臺(tái)，雙方之間區(qū)別越來越小，大多數(shù)新一代的控制系統(tǒng)都不再區(qū)分DCS或者PLC，不過新一代控制器是否叫PLC還是DCS或者FCS、PAC、NCS，這并沒有得到廣大廠商的認(rèn)同。特別是網(wǎng)絡(luò)和現(xiàn)場(chǎng)總線的發(fā)展，使DCS越來越?jīng)]有單獨(dú)存在的價(jià)值，很多的大公司都把新一代的控制系統(tǒng)合并了DCS、PLC、IPC、FCS功能。
為了簡(jiǎn)化各種概念，我們根據(jù)項(xiàng)目的大小、項(xiàng)目的重復(fù)度把PLC的應(yīng)用分為工程和OEM兩部分，其中工程主要指造紙、石化、冶金、水泥、大型港機(jī)等項(xiàng)目特征明顯的自動(dòng)化系統(tǒng)，而OEM主要指各種使用PLC的裝備，如電梯、擠出機(jī)、包裝機(jī)、回流焊、點(diǎn)膠機(jī)、特種車輛等，”這兩大塊構(gòu)成了PLC的主要的市場(chǎng)。



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