E154554，E154554，E154554，
PLC順序控制設計法中的步與動作概念舉例介紹
1. 步
順序控制設計法最基本的思想是將系統(tǒng)的一個工作周期的劃分為若干個順序相連的階段，這些階段稱為步（Step）,可以用編程元件，（例如輔助繼電器M和順序控制繼電器S）來代表各步。步是根據(jù)輸出量的狀態(tài)變化來劃分的，在任何一步之內，各輸出量的ON/OFF狀態(tài)不變，但是相鄰兩步輸出量總的狀態(tài)是不同的，步的這種劃分方法使代表各步的編程元件的狀態(tài)與各輸出量的狀態(tài)是之間有著極為簡單的邏輯關系。
送料小車開始停在左測限們開關X2處（見圖17），按下起動按鈕X0，X2變?yōu)?span>ON，打開貯料斗的閘門，開始裝料，同時用定時器T0定時，10s后關閉貯料斗的閘門，Y0變?yōu)?span>ON，開始右行，碰到限位開關X1后停下來卸料（Y3為ON），同時用定時器T1定時；5s后Y1變?yōu)?span>ON，開始左行，碰到限位開關X2后返回初始狀態(tài)，停止運行。
根據(jù)Y0～Y3的ON/OFF狀態(tài)的變化，顯然一個工作周期可以分為裝料，右行、卸料和左行這4步，另外還應設置等待起動的初始步，分別用M0～M4來代表這5步，圖17左上部是小車運動的空間示意圖，左下部是是有關編程元件的波形圖（時序圖），右邊是描述該系統(tǒng)的順序功能圖，圖中用矩形方框表示步，方框中可以用數(shù)字表示該步的編號，一般用代表該步的編程元件的元件的元件號作為步的編號，如M0等，這樣在根據(jù)順序功能圖設
Reliance 0-49005-1
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