描述
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)中去。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)中去。PLC還可配置上小型打印機,定期把DM區(qū)的數(shù)據(jù)打出來。
PLC也可與計算機通訊,由計算機把DM區(qū)的數(shù)據(jù)讀出,并由計算機再對這些數(shù)據(jù)作處理。這時,PLC即成為計算機的數(shù)據(jù)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(dá)到合理用電與節(jié)約用電的目的。
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