西门子PLCS7-300系列
小型机：小型机的控制点一般在256点之内，适合于单机控制或小型系统的控制。
西门子小型机有S7-200：处理速度0.8~1.2ms ；存贮器2k ；数字量248点；模拟量35路 。
中型机:中型机的控制点一般不大于2048点,可用于对设备进行直接控制，还可以对多个下一级的可编程序控制器进行监控，它适合中型或大型控制系统。
西门子中型机有S7-300：处理速度0.8~1.2ms ；存贮器2k ；数字量1024点；模拟量128路 ；网络PROFIBUS；工业以太网；MPI。
大型机：大型机的控制点一般大于2048点,不仅能完成较复杂的算术运
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