TRICON 3008
TRICON 3008
TRICON 3008
(三) 输出刷新阶段
当扫描用户程序结束后，PLC就进入输出刷新阶段。在此期间，CPU按照I/O映象区内对应的状态和数据刷新所有的输出锁存电路，再经输出电路驱动相应的外设。这时，才是PLC的真正输出。
比较下二个程序的异同：
程序1：
程序2：
这两段程序执行的结果完全一样，但在PLC中执行的过程却不一样。
※ 程序1只用一次扫描周期，就可完成对%M4的刷新；
※ 程序2要用四次扫描周期，才能完成对%M4的刷新。
这两个例子说明：同样的若干条梯形图，其排列次序不同，执行的结果也不同。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和。
备货，备货，降降降，火火火，火火火……
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