描述
3HAC024138-001
實際的物理量，除了開關量、模擬量，還有運動控制。如機床部件的位移，常以數(shù)字量表示。
PLC也是基于計算機的技術，并日益完善。故它也完全可以用于數(shù)字量控制。
PLC可接收計數(shù)脈沖，頻率可高達幾k到幾十k赫茲。可用多種方式接收這脈沖，還可多路接收。有的PLC還有脈沖輸出功能，脈沖頻率也可達幾十k。有了這兩種功能，加上PLC有數(shù)據處理及運算能力，若再配備相應的傳感器（如旋轉編碼器）或脈沖伺服裝置（如環(huán)形分配器、功放、步進電機），則完全可以依NC的原理實現(xiàn)種種控制。
高、中檔的PLC，還開發(fā)有NC單元，或運動單元，可實現(xiàn)點位控制。運動單元還可實現(xiàn)曲線插補，可控制曲線運動。所以，若PLC配置了這種單元，則完全可以用NC的辦法，進行數(shù)字量的控制。
用于數(shù)據采集
隨著PLC技術的發(fā)展，其數(shù)據存儲區(qū)越來越大。如德維森公司的PLC，其數(shù)據存儲區(qū)（DM區(qū)）可達到9999個字。這樣龐大的數(shù)據存儲區(qū)，可以存儲大量數(shù)據。
數(shù)據采集可以用計數(shù)器，累計記錄采集到的脈沖數(shù)，并定時地轉存到DM區(qū)中去。
數(shù)據采集也可用A／D單元，當模擬量轉換成數(shù)字量后，再定時地轉存到DM區(qū)中去。
PLC也可與計算機通訊，由計算機把DM區(qū)的數(shù)據讀出，并由計算機再對這些數(shù)據作處理。這時，PLC即成為計算機的數(shù)據終端。
電力用戶曾使用PLC，用以實時記錄用戶用電情況，以實現(xiàn)不同用電時間、不同計價的收費辦法，鼓勵用戶在用電低谷時多用電，達到合理用電與節(jié)約用電的目的。
用于信號監(jiān)控
PLC自檢信號很多，內部器件也很多，多數(shù)使用者未充分發(fā)揮其作用。
其實，完全可利用它進行PLC自身工作的監(jiān)控，或對控制對象進行監(jiān)控。
對一個復雜的控制系統(tǒng)，特別是自動控制系統(tǒng)，監(jiān)控以至進一步能自診斷是非常必要的。它可減少系統(tǒng)的故障，出了故障也好查找，可提高累計平均無故障運行時間，降低故障修復時間，提高系統(tǒng)的可靠性。
產品承諾：
保?證?全新原裝進口,
保?證?安全準時發(fā)貨，
保?證售后服務質量，
優(yōu)勢價格，大量現(xiàn)貨。
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