ABB DI821 沙河县
这类可编程序控制器，具有基本的控制功能和一般的运算能力。工作速度比较低，能带的输入和输出模块的数量比较少。
比如，德国SIEMENS公司生产的S7-200就属于这一类。
中档机
这类可编程序控制器，具有较强的控制功能和较强的运算能力。它不仅能完成一般的逻辑运算，也能完成比较复杂的三角函数、指数和PID运算。工作速度比较快，能带的输入输出模块的数量也比较多，输入和输出模块的种类也比较多。
比如，德国SIEMENS公司生产的S7-300就属于这一类。
机
这类可编程序控制器，具有强大的控制功能和强大的运算能力。它不仅能完成逻辑运算、三角函数运算、指数运算和PID运算，还能进行复杂的矩阵运算。工作速度很快，能带的输入输出模块的数量很多，输入和输出模块的种类也很。这类可编程序控制器可以完成规模很大的控制任务。在联网中一般做主站使用。
比如，德国SIEMENS公司生产的S7-400就属于这一类。
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