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設計思路本文提出的4種簡易設計方法都是先設計步進階梯，在步進階梯實現由轉步主令信號控制輔助繼電器得失電；然后根據步進階梯設計輸出階梯，在輸出階梯實現由輔助繼電器控制輸出繼電器得失電。這4種設計法所設計的梯形圖電路結構及相應的指令應適用于大多數PLC機型，具有通用性。

由于各種PLC機型的編程元件代號及其編號不盡相同，為便于闡述，本文約定：所有梯形圖中的輸入繼電器、輸出繼電器、輔助繼電器（又稱內部繼電器）的代號分別為：X、Y、M。設計中所用到的某些功能指令，如置位指令約定為S×，復位指令為R×；移位指指令為SR×。其中的“×”表示編程元件的編號，用十進制數表示。用這些方法設計實際的控制系統時，應將編程元件代號和編號變換成所選用的PLC機型對應的代號和編號。

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