西門子PLCS7-300系列
小型機：小型機的控制點一般在256點之內，適合于單機控制或小型系統的控制。
西門子小型機有S7-200：處理速度0.8~1.2ms ；存貯器2k ；數字量248點；模擬量35路 。
中型機:中型機的控制點一般不大于2048點,可用于對設備進行直接控制，還可以對多個下一級的可編程序控制器進行監控，它適合中型或大型控制系統。
西門子中型機有S7-300：處理速度0.8~1.2ms ；存貯器2k ；數字量1024點；模擬量128路 ；網絡PROFIBUS；工業以太網；MPI。
大型機：大型機的控制點一般大于2048點,不僅能完成較復雜的算術運
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