描述
按下正轉(zhuǎn)起動(dòng)按鈕X0或反轉(zhuǎn)起動(dòng)按鈕X1后,要求小車在左限位開關(guān)X3和右限位開關(guān)X4之間不停地循環(huán)往返,直到按下停止按鈕X2。圖中Y0控制右行,Y1控制左行。Y2為制動(dòng)電磁閥。
將圖所示的程序?qū)懭隤LC,檢查無誤后開始運(yùn)行。用實(shí)驗(yàn)板上的鈕子開關(guān)模擬起動(dòng)、停止按鈕信號(hào)和限位開關(guān)信號(hào),通過觀測與Y0、Y1、Y2對應(yīng)的LED,檢查小車的工作情況。注意按以下步驟操作,檢查程序是否正確:
(1)用接在X0的鈕子開關(guān)模擬右行起動(dòng)按鈕信號(hào),即將開關(guān)接通后立即斷開,觀測控制右行的輸出繼電器Y0是否ON。
(2)用接在X4的鈕子開關(guān)模擬右限位開關(guān)信號(hào),即將開關(guān)接通后立即斷開,觀測控制右行的輸出繼電器Y0是否OFF,控制左行的輸出繼電器Y1是否ON。
(3)用接在X3的鈕子開關(guān)模擬左限位開關(guān)信號(hào),即將開關(guān)接通后立即斷開,觀測控制左行的輸出繼電器Y1是否OFF,控制右行的輸出繼電器Y0是否ON。
(4)重復(fù)第(2)步和第(3)步的操作。
(5)用接在X2的鈕子開關(guān)模擬停止按鈕信號(hào),即將開關(guān)接通后立即斷開,觀測Y0或Y1是否OFF,控制制動(dòng)的輸出繼電器Y2是否ON。
(6)觀測6秒后Y2是否自動(dòng)OFF。
如果發(fā)現(xiàn)PLC的輸入輸出關(guān)系不符合上述要求,檢查程序,改正錯(cuò)誤。
2.較復(fù)雜的自動(dòng)小車往返運(yùn)動(dòng)控制程序?qū)嶒?yàn)
在圖所示系統(tǒng)的基礎(chǔ)上,增加延時(shí)功能,即小車碰到限位開關(guān)X4后停止運(yùn)行,延時(shí)5秒后自動(dòng)左行;小車碰到限位開關(guān)X3后停止左行,延時(shí)3秒后自動(dòng)右行。
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