反向變換線圈-(↓)-如果與該線圈相關(guān)的參考地址為OFF,且線圈停止接收電能,則參考地址置ON,直至下次線圈被執(zhí)行為止。不要從外部設(shè)備寫人區(qū)變換線圈所用的參考地址,因為這將破壞這種線圓的具有的單穩(wěn)特性。轉(zhuǎn)換線圈可與來自保持或非保持性存貯器(%Q,%M,%G,%T,%SA,%SB或%SC)的地址共用。示例:在下例中,當(dāng)參考地址E1由OFF轉(zhuǎn)到ON,線圈E2和E3通流，使E2為ON,則有一次邏輯掃描。當(dāng)E1由ON轉(zhuǎn)到OFF,電流從E2和E3中消失,使E3為ON,則有一次掃描。

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