PLC中的CPU与存储器配合，完成控制功能。它与DCS系统处理温度、压力、流量等参数的系统不同，采用快速的巡回扫描周期，一般为0.1~0.2s，更快的则选用50ms或更小的扫描周期。它是一个数字采样控制系统。

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