描述
PLC除逻辑运算外，控制回路用的算法功能已经大大加强，但plc用梯形图编程，模拟量的运算在编程时不太直观，编程比较麻烦。但在解算逻辑方面，表现出快速的优点，在微秒量级，解算1k逻辑程序不到1毫秒。它把所有的输入都当成开关量来处理，16位（也有32位的）为一个模拟量
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