描述
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(shí)地轉(zhuǎn)存到DM區(qū)中去。
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(lái)。
PLC也可與計(jì)算機(jī)通訊,由計(jì)算機(jī)把DM區(qū)的數(shù)據(jù)讀出,并由計(jì)算機(jī)再對(duì)這些數(shù)據(jù)作處理。這時(shí),PLC即成為計(jì)算機(jī)的數(shù)據(jù)終端。
電業(yè)部門曾這么使用PLC,用以實(shí)時(shí)記錄用戶用電情況,以實(shí)現(xiàn)不同用電時(shí)間、不同計(jì)價(jià)的收費(fèi)辦法,鼓勵(lì)用戶在用電低谷時(shí)多用電,達(dá)到合理用電與節(jié)約用電的目的。
5用于進(jìn)行監(jiān)控
PLC自檢信號(hào)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。
其實(shí),完全可利用它進(jìn)行PLC自身工作的監(jiān)控,或?qū)刂茖?duì)象進(jìn)行監(jiān)控。
這里介紹一種用PLC定時(shí)器作看門狗,對(duì)控制對(duì)象工作情況進(jìn)行監(jiān)控的思路。
如用PLC控制某運(yùn)動(dòng)部件動(dòng)作,看施加控制后動(dòng)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(shí),令看門狗定時(shí)器計(jì)時(shí)。如在規(guī)定的時(shí)間內(nèi)動(dòng)作完成,即定時(shí)器未超過(guò)警戒值的情況下,已收到動(dòng)作完成信號(hào),則說(shuō)明控制對(duì)象工作正常,無(wú)需報(bào)警。
若超時(shí),說(shuō)明不正常,可作相應(yīng)處理。
如果控制對(duì)象的各重要控制環(huán)節(jié),都用這樣一些看門狗”看”著,那系統(tǒng)的工作將了如指掌,出現(xiàn)了問題,卡在什么環(huán)節(jié)上也很好查找。
還有其它一些監(jiān)控工作可做。對(duì)一個(gè)復(fù)雜的控制系統(tǒng),特別是自動(dòng)控制系統(tǒng),監(jiān)控以至進(jìn)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(jì)平均無(wú)故障運(yùn)行時(shí)間,降低故障修復(fù)時(shí)間,提高系統(tǒng)的可靠性。
歐美品牌停產(chǎn)的,常用的“PLC”備品備件
我司產(chǎn)品應(yīng)用于以下領(lǐng)域:
1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》
2,《智能平鋼化爐系統(tǒng)制造》
3,《PLC可編程輸送控制系統(tǒng)》
4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》
6,《化工廠藥液恒流量計(jì)算機(jī)控制系統(tǒng)》
7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動(dòng)化控制系列
本特利,英維思,伍德沃德,??怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂,ACSO,力士樂等各大品牌的DCS系統(tǒng)配件,機(jī)器人系統(tǒng)配件,大型伺服系統(tǒng)備件。
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