6FX1111-0AG02-+-6FX1111-0AG02

個人感覺好像用R、S更復雜一些，要考慮條件，經常出現(xiàn)R和S條件同時滿足的情況，導致控制出問題。
答：采用賦值（=）還是R/S S/R要根據(jù)實際情況來確定的， R S指令能實現(xiàn)的功能，賦值（=）指令不一定可以實現(xiàn)，而賦值指令能實現(xiàn)的功能就一定可以用 R S指令來做到。
    然而如果用 R S指令來替代賦值指令功能，則會導致程序指令數(shù)量大幅增加，使得簡單程序變得更復雜，程序變得很冗長，也無形中加長了循環(huán)周期時長，對小程序來說影響不大，但對于復雜的大型程序來說這是不可取的，程序越精簡，執(zhí)行就越精準，用無謂的語句來使程序變復雜是編程的忌諱。就如樓上所舉的例子，用賦值指令二條語句就能完成的，用R、S指令就至少需要4條指令。

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    “經常出現(xiàn)R和S條件同時滿足的情況，導致控制出問題。”這就要看你的實際需要來選擇R/S（置位優(yōu)先）還是S/R（復位優(yōu)先）了，選擇R/S當條件同時滿足時結果是1（置位），而選擇S/R則當條件同時滿足時結果為0（復位）。明白了這一點，就不會導致控制出問題了。
    賦值指令和S R指令無所謂哪一個更好，要根據(jù)你的程序所需來確定。編程的原則是越簡單越好，千萬不要簡單語句復雜化。

你需要了解r,s以及線圈的功能。線圈的功能就是保持線圈的值和狀態(tài)位一致，r是狀態(tài)為1復位輸出，s狀態(tài)為1置位輸出。r,s可以保持輸出狀態(tài)狀態(tài)，知道下一個指令改變輸出值。

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