包括和應(yīng)用。
(1):
ABB Master Piece200單元是一高性能32位微處理器。存儲(chǔ)在EPROM模塊中,包括一個(gè)實(shí)時(shí)操作和一個(gè)ABB Master Piece語(yǔ)言(AMPL)執(zhí)行器。
(2)應(yīng)用
應(yīng)用存儲(chǔ)在帶后備電池的RWM(讀/寫(xiě)存儲(chǔ)器)中,用ABB Master Piece語(yǔ)言(AMPL)編制,實(shí)現(xiàn)了結(jié)構(gòu)化程序設(shè)計(jì)。工業(yè)控制程序往往功能繁多該語(yǔ)言根據(jù)工業(yè)控制要求,將編程元素設(shè)計(jì)成一個(gè)個(gè)圖形功能塊,稱為PC元素。PC元素內(nèi)有三種結(jié)構(gòu)類元素GM、CONTRM和FUNCM,GM是程序結(jié)構(gòu)的高層,旨在完成一個(gè)完整的控制功能,一個(gè)GM下允許一個(gè)或幾個(gè)CONTRM,而一個(gè)CONTRM下又可包含一個(gè)或幾個(gè)FUNCM,從而使整個(gè)程序結(jié)構(gòu)呈階梯狀,實(shí)現(xiàn)了結(jié)構(gòu)化設(shè)計(jì)。
另外,在CPU內(nèi)還有一個(gè)實(shí)時(shí)數(shù)據(jù)庫(kù),它的作用是存儲(chǔ)數(shù)據(jù)和在程序間傳遞數(shù)據(jù)。數(shù)據(jù)庫(kù)內(nèi)的元素稱為DB元素,這些元素包括站所使用的的I/O模板和及程序中產(chǎn)生的其它數(shù)據(jù)信息。
【公司名稱】武漢達(dá)自動(dòng)化設(shè)備有限公司
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【地址:】武漢市東西湖區(qū)走馬嶺匯通公路港信息交易中心3-035
1.處理單元(CPU)
同一般的微機(jī)一樣,CPU是PLC的核心。PLC中所配置的CPU 隨機(jī)型不同而不同,常用有三類:通用微處理器(如Z80、8086、80286等)、單片微處理器(如8031、8096等)和位片式微處理器(如AMD29W等) 。小型PLC大多采用8位通用微處理器和單片微處理器;中型PLC大多采用16位通用微處理器或單片微處理器;大型PLC大多采用高速位片式微處理器。
目前,小型PLC為單CPU,而中、大型PLC則大多為雙CPU,甚至有些PLC中多達(dá)8 個(gè)CPU。對(duì)于雙CPU,一般一個(gè)為字處理器,一般采用8位或16位處理器;另一個(gè)為位處理器,采用由各廠家設(shè)計(jì)制造的專用芯片。字處理器為主處理器,用于執(zhí)行編程器接口功能,內(nèi)部定時(shí)器,掃描時(shí)間,處理字節(jié)指令以及對(duì)總線和位處理器進(jìn)行控制等。位處理器為從處理器,主要用于處理位操作指令和實(shí)現(xiàn)PLC編程語(yǔ)言向機(jī)器語(yǔ)言的轉(zhuǎn)換。位處理器的采用,了PLC的速度,使PLC更好地實(shí)時(shí)控制要求。
在PLC中CPU按程序賦予的功能,指揮PLC有條不紊地進(jìn)行工作,歸納起來(lái)主要有以下幾個(gè)方面:
1) 接收從編程器輸入的用戶程序和數(shù)據(jù)。
2) 診斷電源、PLC內(nèi)部電路的工作故障和編程中的語(yǔ)法錯(cuò)誤等。
3) 通過(guò)輸入接口接收現(xiàn)場(chǎng)的狀態(tài)或數(shù)據(jù),并存入輸入映象寄有器或數(shù)據(jù)寄存器中。
4) 從存儲(chǔ)器逐條讀取用戶程序,經(jīng)過(guò)解釋后執(zhí)行。
5) 根據(jù)執(zhí)行的結(jié)果,更新有關(guān)標(biāo)志位的狀態(tài)和輸出映象寄存器的內(nèi)容,通過(guò)輸出單元實(shí)現(xiàn)輸出控制。有些PLC還具有制表打印或數(shù)據(jù)通信等功能
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67、只有人們的社會(huì)實(shí)踐,才是人們對(duì)于外界認(rèn)識(shí)的真理性的。真理的只能是社會(huì)的實(shí)踐。
165、凡是敵人反對(duì)的,我們就要擁護(hù);凡是敵人擁護(hù)的,我們就要反對(duì)。
44可憐無(wú)定河邊骨,猶是春閨夢(mèng)裏人。-陳陶《隴西行》-