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實(shí)際的物理量，除了開關(guān)量、模擬量，還有運(yùn)動控制。如機(jī)床部件的位移，常以數(shù)字量表示。 
運(yùn)動控制，有效的辦法是NC，即數(shù)字控制技術(shù)。這是50年代誕生于美國的基于計算機(jī)的控制技術(shù)。當(dāng)今已很普及，并也很完善。目前，*國家的金屬切削機(jī)床，數(shù)控化的比率已超過40％～80％，有的甚至更高。 
PLC也是基于計算機(jī)的技術(shù)，并日益完善。故它也*可以用于數(shù)字量控制。 
PLC可接收計數(shù)脈沖，頻率可高達(dá)幾k到幾十k赫茲?？捎枚喾N方式接收這脈沖，還可多路接收。有的PLC還有脈沖輸出功能，脈沖頻率也可達(dá)幾十k。有了這兩種功能，加上PLC有數(shù)據(jù)處理及運(yùn)算能力，若再配備相應(yīng)的傳感器（如旋轉(zhuǎn)編碼器）或脈沖伺服裝置（如環(huán)形分配器、功放、步進(jìn)電機(jī)），則*可以依NC的原理實(shí)現(xiàn)種種控制。 
高、中檔的PLC，還開發(fā)有NC單元，或運(yùn)動單元，可實(shí)現(xiàn)點(diǎn)位控制。運(yùn)動單元還可實(shí)現(xiàn)曲線插補(bǔ)，可控制曲線運(yùn)動。所以，若PLC配置了這種單元，則*可以用NC的辦法，進(jìn)行數(shù)字量的控制。 
新開發(fā)的運(yùn)動單元，甚至還發(fā)行了NC技術(shù)的編程語言，為更好地用PLC進(jìn)行數(shù)字控制提供了方便。 
3.4用于數(shù)據(jù)采集 
隨著PLC技術(shù)的發(fā)展，其數(shù)據(jù)存儲區(qū)越來越大。如德維森公司的PLC，其數(shù)據(jù)存儲區(qū)（DM區(qū)）可達(dá)到9999個字。這樣龐大的數(shù)據(jù)存儲區(qū)，可以存儲大量數(shù)據(jù)。 
數(shù)據(jù)采集可以用計數(shù)器，累計記錄采集到的脈沖數(shù)，并定時地轉(zhuǎn)存到DM區(qū)中往。 
數(shù)據(jù)采集也可用A/D單元，當(dāng)模擬量轉(zhuǎn)換成數(shù)字量后，再定時地轉(zhuǎn)存到DM區(qū)中往。 
PLC還可配置上小型打印機(jī)，定期把DM區(qū)的數(shù)據(jù)打出來。 
PLC也可與計算機(jī)通訊，由計算機(jī)把DM區(qū)的數(shù)據(jù)讀出，并由計算機(jī)再對這些數(shù)據(jù)作處理。這時，PLC即成為計算機(jī)的數(shù)據(jù)終端。 
電力用戶曾使用PLC，用以實(shí)時記錄用戶用電情況，以實(shí)現(xiàn)不同用電時間、不同計價的收費(fèi)辦法，鼓勵用戶在用電低谷時多用電，達(dá)到公道用電與節(jié)約用電的目的。 
3.5用于信號監(jiān)控 
PLC自檢信號很多，內(nèi)部器件也很多，多數(shù)使用者未充分發(fā)揮其作用。 
實(shí)在，*可利用它進(jìn)行PLC自身工作的監(jiān)控，或?qū)刂茖ο筮M(jìn)行監(jiān)控。 
這里介紹一種用PLC定時器作看門狗，對控制對象工作情況進(jìn)行監(jiān)控的思路。 
如用PLC控制某運(yùn)動部件動作，看施加控制后動作進(jìn)行了沒有，可用看門狗辦法實(shí)現(xiàn)監(jiān)控。具體作法是在施加控制的同時，令看門狗定時器計時。如在規(guī)定的時間內(nèi)動作完成，即定時器未超過警戒值的情況下，已收到動作完成信號，則說明控制對象工作正常，無需報警。 
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