S7-200是西德西門子公司的產品之一，其注冊商標為SIMATIC。
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）及控調技術溶為一體
6．現在，西門子公司又提出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。
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資訊來源：福州卓凱