描述
1.高速計(jì)數(shù)器概述
21點(diǎn)高速計(jì)數(shù)器C235~C255共用PLC的8個(gè)高速計(jì)數(shù)器輸入端X0~X7,某一輸入端同時(shí)只能供一個(gè)高速計(jì)數(shù)器使用。這21個(gè)計(jì)數(shù)器均為32位加/減計(jì)數(shù)器(見(jiàn)表3–7)。不同類型的高速計(jì)數(shù)器可以同時(shí)使用,但是它們的高速計(jì)數(shù)器輸入不能沖突。
高速計(jì)數(shù)器的運(yùn)行建立在中斷的基礎(chǔ)上,這意味著事件的觸發(fā)與掃描時(shí)間無(wú)關(guān)。在對(duì)外部高速脈沖計(jì)數(shù)時(shí),梯形圖中高速計(jì)數(shù)器的線圈應(yīng)一直通電,以表示與它有關(guān)的輸入點(diǎn)已被使用,其他高速計(jì)數(shù)器的處理不能與它沖突??捎眠\(yùn)行時(shí)一直為ON的M8000的常開觸點(diǎn)來(lái)驅(qū)動(dòng)高速計(jì)數(shù)器的線圈。
例如在圖1中,當(dāng)X14為ON時(shí),選擇了高速計(jì)數(shù)器C235,從表3–7可知,C235的計(jì)數(shù)輸入端是X0,但是它并不在程序中出現(xiàn),計(jì)數(shù)信號(hào)不是X14提供的。
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,福克斯波羅、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(lè),ACSO,力士樂(lè)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。
Motorola MVME167A e-mail
Motorola MVME167B e-mail
Motorola MVME167C e-mail
Motorola MVME167P-24SE e-mail
Motorola MVME167P-35SE e-mail
Motorola MVME167PA-36SE e-mail
Motorola MVME167P-36SE e-mail
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Motorola MVME197LE 50MHz 64MB 14
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