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ELAU VW3E1111R100構(gòu)建高效穩(wěn)定的工控網(wǎng)絡(luò)
掃描模式
掃描方式定義了各種任務(wù)在CPU執(zhí)行過(guò)程中的優(yōu)先級(jí)，以及分配給各個(gè)任務(wù)的時(shí)間。參數(shù)可以根據(jù)掃描方式進(jìn)行修改。根據(jù)PLC掃描方式的不同，控制器通訊窗口(Controller Communication Window),背板通訊窗口(Backplane Communication Window)和后臺(tái)窗P(BackgroundWindow)以不同的模式運(yùn)行
選項(xiàng):
■Normal模式: PLC|盡可 能快的完成掃描，掃描時(shí)間依賴于邏輯程序和窗口進(jìn)程要求。此模式下總的掃描時(shí)間等于邏輯執(zhí)行時(shí)間和各個(gè)窗口定時(shí)器數(shù)值的總和。完成自己的所有任務(wù)后，窗口關(guān)閉。這是一個(gè)缺省值。
■Constant Window模式:每-一個(gè)窗口都以Run-to-Completion模式模式執(zhí)行。PLC按照窗口定時(shí)器的設(shè)定參數(shù)輪流執(zhí)行三個(gè)窗口。總的PLC掃描時(shí)間等于窗口定時(shí)器設(shè)定值加上程序執(zhí)行時(shí)間。這個(gè)時(shí)間會(huì)因程序邏輯的執(zhí)行時(shí)間不同而不同。
■Constant Sweep模式:總的PLC掃描時(shí)間固定。次掃描過(guò)程中，某些窗口-甚至所有的窗口都可能不被執(zhí)行。本次掃描時(shí)間達(dá)到掃描定時(shí)器的設(shè)定值時(shí)，窗口停止執(zhí)行。
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