Constant窗口模式下，每次掃描時間可以不同。邏輯窗口在每–次掃描過程中完全執(zhí)行。CPU輪流執(zhí)行控制器通訊窗口，背板通訊窗口和后臺窗口，執(zhí)行時間為設(shè)定的掃描時間?？傆?jì)的CPU掃描時間等于內(nèi)部處理時間，輸入掃描，邏輯窗口和輸出掃描階段的執(zhí)行時間以及Constant窗口定時器設(shè)定時間總和。整個掃描時間可能因邏輯窗口的執(zhí)行時間的不同而不同。

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