UFC760BE41 3BHE004573R0041 ABB 逻辑窗口在每–次扫描过程中完全执行。CPU轮流执行控制器通讯窗口，背板通讯窗口和后台窗口

Constant窗口模式下，每次扫描时间可以不同。逻辑窗口在每–次扫描过程中完全执行。CPU轮流执行控制器通讯窗口，背板通讯窗口和后台窗口，执行时间为设定的扫描时间。总计的CPU扫描时间等于内部处理时间，输入扫描，逻辑窗口和输出扫描阶段的执行时间以及Constant窗口定时器设定时间总和。整个扫描时间可能因逻辑窗口的执行时间的不同而不同。

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