另外,也可以看到:采用扫描用户程序的运行结果与继电器控制装置的硬逻辑并行运行的结果有所区别。当然,如果扫描周期所占用的时间对整个运行来说可以忽略,那么二者之间就没有什么区别了。一般来说,PLC 的扫描周期包括自诊断、通讯等,如下图所示,即一个扫描周期等于自诊断、通讯、输入采样、用户程序执行、输出刷新等所有时间的总和。
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