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目前，在連續(xù)型流程生產(chǎn)自動控制（PA）或習慣稱之謂工業(yè)過程控制中，有三大控制系統(tǒng)，即PLC、DCS和FCS。它們各自的基本特點如下：
1 PLC

（1）從開關量控制發(fā)展到順序控制、運送處理，是從下往上的。
（2）連續(xù)PID控制等多功能，PID在中斷站中。
（3）可用一臺PC機為主站，多臺同型PLC為從站。
（4）也可一臺PLC為主站，多臺同型PLC為從站，構成PLC網(wǎng)絡。這比用PC機作主站方便之處是：有用戶編程時，不必知道通信協(xié)議，只要按說明書格式寫就行。
（5）PLC網(wǎng)格既可作為獨立DCS/TDCS，也可作為DCS/TDCS的子系統(tǒng)。
（6）大系統(tǒng)同DCS/TDCS，如TDC3000、CENTUMCS、WDPFI、MOD300。
（7）PLC網(wǎng)絡如Siemens公司的SINEC—L1、SINEC—H1、S4、S5、S6、S7等，GE公司的GENET、三菱公司的MELSEC—NET、MELSEC—NET/MINI。
（8）主要用于工業(yè)過程中的順序控制，新型PLC也兼有閉環(huán)控制功能。
（9）制造商：GOULD（美）、AB（美）、GE（美）、OMRON（日）、MITSUBISHI（日）、Siemens（德）等。

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