德國西門子（SIEMENS）公司生產的可編程序控制器在我國的應用也相當廣泛，在冶金、化工、印刷生產線等領域都有應用。西門子（SIEMENS）公司的PLC產品包括LOGO、S7-200、S7-1200、S7-300、S7-400等。 西門子S7系列PLC體積小、速度快、標準化，具有網絡通信能力，功能更強，可靠性高。S7系列PLC產品可分為微型PLC（如S7-200），小規模性能要求的PLC（如S7-300）和中、高性能要求的PLC（如S7-400）等。
上海施承電氣自動化有限公司
聯系人：黃經理
手機：135-6425-5051 QQ：2271-387-194
電話：021-3166-2619 傳真：021-6781-7055
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西門子SIMATIC系列PLC，誕生于1958年，經歷了C3,S3,S5,S7系列，已成為應用非常廣泛的可編程控制器。
西門子（SIMATIC）PLC的6代
1、西門子公司的產品最早是1975年投放市場的SIMATIC S3，它實際上是帶有簡單操作接口的二進制控制器。
2、1979年，S3系統被SIMATIC S5所取代，該系統廣泛地使用了微處理器。
3、20世紀80年代初，S5系統進一步升級——U系列PLC，較常用機型：S5-90U、95U、100U、115U、135U、155U。
4、1994年4月，S7系列誕生，它具有更國際化、更高性能等級、安裝空間更小、更良好的WINDOWS用戶界面等優勢，其機型為：S7-200、300、400。
5、1996年，在過程控制領域，西門子公司又提出PCS7（過程控制系統7）的概念，將其優勢的WINCC（與WINDOWS兼容的操作界面）、PROFIBUS（工業現場總線）、COROS（監控系統）、SINEC（西門子工業網絡）及控調技術融為一體。
6、西門子公司提出TIA（Totally Integrated Automation）概念，即全集成自動化系統，將PLC技術溶于全部自動化領域。
由最初發展至今，S3、S5系列PLC已逐步退出市場，停止生產，而S7系列PLC發展成為了西門子自動化系統的控制核心，而TDC系統沿用SIMADYN D技術內核，是對S7系列產品的進一步升級，它是西門子自動化系統最尖端，功能最強的可編程控制器。