包括和應用。
(1):
ABB Master Piece200單元是一高性能32位微處理器。存儲在EPROM模塊中,包括一個實時操作和一個ABB Master Piece語言(AMPL)執(zhí)行器。
(2)應用
應用存儲在帶后備電池的RWM(讀/寫存儲器)中,用ABB Master Piece語言(AMPL)編制,實現(xiàn)了結構化程序設計。工業(yè)控制程序往往功能繁多該語言根據(jù)工業(yè)控制要求,將編程元素設計成一個個圖形功能塊,稱為PC元素。PC元素內(nèi)有三種結構類元素GM、CONTRM和FUNCM,GM是程序結構的高層,旨在完成一個完整的控制功能,一個GM下允許一個或幾個CONTRM,而一個CONTRM下又可包含一個或幾個FUNCM,從而使整個程序結構呈階梯狀,實現(xiàn)了結構化設計。
另外,在CPU內(nèi)還有一個實時數(shù)據(jù)庫,它的作用是存儲數(shù)據(jù)和在程序間傳遞數(shù)據(jù)。數(shù)據(jù)庫內(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】武漢達自動化設備有限公司
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2.存儲器
存儲器主要有兩種:一種是可讀/寫操作的隨機存儲器RAM,另一種是只讀存儲器ROM、PROM 、EPROM 和EEPROM。在PLC中,存儲器主要用于存放程序、用戶程序及工作數(shù)據(jù)。
程序是由PLC 的制造廠家編寫的,和PLC的硬件組成有關,完成診斷、命令解釋、功能子程序調用、邏輯運算、通信及各種參數(shù)設定等功能,提供PLC運行的平臺。程序關系到PLC的性能,而且在PLC使用中不會變動,所以是由制造廠家直接固化在只讀存儲器ROM、PROM或EPROM中,用戶不能訪問和修改。
用戶程序是隨PLC的控制對象而定的,由用戶根據(jù)對象生產(chǎn)工藝的控制要求而編制的應用程序。為了便于讀出、檢查和修改,用戶程序一般存于CMOS靜態(tài)RAM中,用鋰電池作為后備電源,以保證掉電時不會丟失信息。為了防止對RAM中程序的,當用戶程序經(jīng)過運行正常,不需要改變,可將其固化在只讀存儲器EPROM中。現(xiàn)在有許多PLC直接采用EEPROM作為用戶存儲器。
工作數(shù)據(jù)是PLC運行中經(jīng)常變化、經(jīng)常存取的一些數(shù)據(jù)。存RAM中,以適應隨機存取的要求。在PLC的工作數(shù)據(jù)存儲器中,設有存放輸入輸出繼電器、輔助繼電器、定時器、計數(shù)器等邏輯器件的存儲區(qū),這些器件的狀態(tài)都是由用戶程序的初始設置和運行情況而確定的。根據(jù)需要,部分數(shù)據(jù)在掉電時用后備電池維持其現(xiàn)有的狀態(tài),這部分在掉電時可保存數(shù)據(jù)的存儲區(qū)域稱為保持數(shù)據(jù)區(qū)。
由于程序及工作數(shù)據(jù)與用戶無直接聯(lián)系,所以在PLC 產(chǎn)品樣本或使用手冊中所列存儲器的形式及容量是指用戶程序存儲器。當PLC提供的用戶存儲器容量不夠用,許多PLC還提供有存儲器擴展功能。
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83、做一次好事容易
93、成熟是一種明亮而不刺眼的光輝,一種而不膩耳的音響,一種不需要對別人察顏觀色的從容,一種終于停止了向周圍申訴求告的大氣,一種不理會哄鬧的微笑,一種洗刷了偏激的淡漠,一種無須聲張的厚實,一種并不陡峭的高度。
20、Live well, love lots, and laugh often. 善待生活,熱愛一切,經(jīng)常開懷大笑。