穆勒 PS416 CPU-400

穆勒 PS416 CPU-400
穆勒 PS416 CPU-400
穆勒 PS416 CPU-400
同时还要有模拟量输入单元（A/D），把这些标准的电信号变换成数字信号；模拟量输出单元（D/A），以把PLC处理后的数字量变换成模拟量——标准的电信号。
所以标准电信号、数字量之间的转换就要用到各种运算。这就需要搞清楚模拟量单元的分辨率以及标准的电信号。例如：
PLC模拟单元的分辨率是1/32767，对应的标准电量是0—10V，所要检测的是温度值0—100℃。那么0—32767对应0—100℃的温度值。然后计算出1℃所对应的数字量是327.67。如果想把温度值到0.1℃，把327.67/10即可。
模拟量控制包括：反馈控制、前馈控制、比例控制、模糊控制等。这些都是PLC内部数字量的计算过程。

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