1.點(diǎn)動(dòng)控制時(shí)，按點(diǎn)動(dòng)正轉(zhuǎn)按鈕，電動(dòng)機(jī)正轉(zhuǎn)點(diǎn)動(dòng)運(yùn)行，運(yùn)料年左行；按點(diǎn)動(dòng)反轉(zhuǎn)按鈕，電動(dòng)機(jī)反轉(zhuǎn)點(diǎn)動(dòng)運(yùn)行，運(yùn)料車(chē)右行。2.連續(xù)控制時(shí)，按正轉(zhuǎn)按鈕，電動(dòng)機(jī)連續(xù)正轉(zhuǎn)，運(yùn)科車(chē)連續(xù)左行；按反轉(zhuǎn)按鈕，電動(dòng)機(jī)連續(xù)反轉(zhuǎn)，運(yùn)料車(chē)連續(xù)右行；按停止按鈕，運(yùn)料車(chē)隨時(shí)停止。3.運(yùn)料車(chē)應(yīng)有軟、硬件互鎖控制功能。要求用前面已經(jīng)學(xué)過(guò)的編程元件和試著編寫(xiě)PLC控制編程（梯形圖）：（1）用觸點(diǎn)線圈指令編程；（2）用置位復(fù)位指令編程;（3）用跳轉(zhuǎn)與跳轉(zhuǎn)標(biāo)號(hào)指令編程。一、設(shè)計(jì)電氣原理圖1.選擇電器元件及PLC型號(hào)輸入信號(hào)：點(diǎn)動(dòng)正轉(zhuǎn)按鈕1個(gè)、點(diǎn)動(dòng)反轉(zhuǎn)按鈕1個(gè)、連續(xù)正轉(zhuǎn)按鈕1個(gè)、連續(xù)反轉(zhuǎn)按紐1個(gè)、停止按鈕1個(gè)，輸入信號(hào)共5個(gè)，要占用5個(gè)輸入端子，所以PLC輸入至少需5點(diǎn)。（這里說(shuō)明一下，限位因篇幅的原因，不做考慮）。輸出信號(hào)：正轉(zhuǎn)接觸器1個(gè)、反轉(zhuǎn)接觸器1個(gè)，占用PLC兩個(gè)輸出端子，所以PLC輸出至少需2點(diǎn)。查西門(mén)子PLC用戶手冊(cè)可知，CPU221主機(jī)輸入6點(diǎn)、輸出4點(diǎn)，能滿足實(shí)際需求的輸入5點(diǎn)輸出2點(diǎn)的要求。因PLC控制電動(dòng)機(jī)，所以繼電器輸出型的PLC就能滿足要求，選擇CPU221繼電器輸出型的PLC即可。2. 設(shè)計(jì)電氣原理圖

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