IC697CHS790 IC697CHS790IC697CHS790 IC697CHS790
可編程控制器類型
4.1按控制規模分
控制規模主要指控制開關量的入、出點數及控制模擬量的模入、模出，或兩者兼而有之（閉路系統）的路數。但主要以開關量計。模擬量的路數可折算成開關量的點，大致一路相當于8～16點。
依這個點數，PLC大致可分為微型機、小型機、中型機及大型機、超大型機。
微型機控制點僅幾十點，如德維森公司的V80系列PLC本體從16點到40點，OMRON公司的CPM1A系列PLC，西門子的Logo僅10點。
小型機控制點可達100多點。如如德維森公司的V80系列PLC可擴展到256點，OMRON公司的C60P可達148點，CQM1達256點。德國西門子公司的S7-200機可達64點。
中型機控制點數可達近500點，以至于千點。如德維森公司的PPC11系列可擴展到1024點，OMRON公司C200H機普通配置zui多可達700多點，C200Ha機則可達1000多點。德國西門子公司的S7300機zui多可達512點。
大型機：控制點數一般在1000點以上。如如德維森公司的PPC22系列可擴展到2048點，OMRON公司的C1000H、CV1000，當地配置可達1024點。C2000H、CV2000當地配置可達2048點。
超大型機：控制點數可達萬點，以至于幾萬點。如美國GE公司的90－70機，其點數可達24000點，另外還可有8000路的模擬量。再如美國*康公司的PC－E984--785機，其開關量具總數為32k（32768），模擬量有2048路。西門子的SS－115U－CPU945，其開關量總點數可達8k，另外還可有512路模擬量。等等。
以上這種劃分是不嚴格的，只是大致的，目的是便于系統的配置及使用。
一般講，根據實際的I/O點數，凡落在上述不同范圍者，選用相應的機型，性能價格比必然要高；相反，肯定要差些。
自然，也有特殊情況。如控制點數不是非常之多，不是非用大型機不可，但因大型機的特殊控制單元多，可進行熱備配置，因而采用了大型機。
手機
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鄭娟萍
廈門仲鑫航自動化設備有限公司
4.2按結構劃分
PLC可分為箱體式及模塊式兩大類。微型機、小型機多為箱體式的，但從發展趨勢看，小型機也逐漸發展成模塊式的了。如OMRON公司，原來小型機都是箱體式，現在的CQM1則為模塊式的。
箱體的PLC把電源、CPU、內存、I/O系統都集成在一個小箱體內。一個主機箱體就是一臺完整的PLC，就可用以實現控制。控制點數不符需要，可再接擴展箱體，由主箱體及若干擴展箱體組成較大的系統，以實現對較多點數的控制。
模塊式的PLC是按功能分成若干模塊，如CPU模塊、輸入模塊、輸出模塊、電源模塊等等。大型機的模塊功能更單一一些，因而模塊的種類也相對多些。這也可說是趨勢。目前一些中型機，其模塊的功能也趨于單一，種類也在增鄉。如同樣OMRON公司C20系列PLC，H機的CPU單元就含有電源，而Ha機則把電源分出，有單獨的電源模塊。
模塊功能更單一、品種更多，可便于系統配置，使PLC更能物盡其用，達到更高的使用效益。
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