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供應(yīng)6ISA槽工業(yè)底板 CP-6SI;
6ISA槽工業(yè)底板 CP-6SI;
在PLC系統(tǒng)規(guī)劃時(shí),首先應(yīng)斷定控制計(jì)劃,下一步作業(yè)即是PLC工程規(guī)劃選型。工藝流程的特色和運(yùn)用請(qǐng)求是規(guī)劃選型的依據(jù)。PLC及有關(guān)設(shè)備應(yīng)是集成的、規(guī)范的,按照易于與工業(yè)控制系統(tǒng)構(gòu)成一個(gè)全體,易于擴(kuò)大其功能的原則選型所選用PLC應(yīng)是在有關(guān)工業(yè)范疇有投運(yùn)成績(jī)、老練可靠的系統(tǒng),PLC的系統(tǒng)硬件、軟件裝備及功能應(yīng)與設(shè)備規(guī)劃和控制請(qǐng)求相慣。熟悉可編程序控制器、功能表圖及有關(guān)的編程言語(yǔ)有利于縮短編程時(shí)刻,因而,工程規(guī)劃選型和預(yù)算時(shí),應(yīng)詳細(xì)分析工藝進(jìn)程的特色、控制請(qǐng)求,清晰控制使命和規(guī)模斷定所需的操作和動(dòng)作,然后依據(jù)控制請(qǐng)求,預(yù)算輸入輸出點(diǎn)數(shù)、所需存儲(chǔ)器容量、斷定PLC的功能、外部設(shè)備特性等,*終挑選有較高性能報(bào)價(jià)比的PLC和規(guī)劃相應(yīng)的控制系統(tǒng)。
一、輸入輸出(I/O)點(diǎn)數(shù)的預(yù)算
I/O點(diǎn)數(shù)預(yù)算時(shí)應(yīng)思考適當(dāng)?shù)挠嗔?,通常依?jù)計(jì)算的輸入輸出點(diǎn)數(shù),再添加10%~20%的可拓展,余量后,作為輸入輸出點(diǎn)數(shù)預(yù)算數(shù)據(jù)。實(shí)踐訂購(gòu)時(shí),還需依據(jù)制造廠商PLC的商品特色,對(duì)輸入輸出點(diǎn)數(shù)進(jìn)行圓整。
二、存儲(chǔ)器容量的預(yù)算
存儲(chǔ)器容量是可編程序控制器自身能供給的硬件存儲(chǔ)單元巨細(xì),程序容量是存儲(chǔ)器中用戶運(yùn)用項(xiàng)目運(yùn)用的存儲(chǔ)單元的巨細(xì),因而程序容量小于存儲(chǔ)器容量。規(guī)劃階段,因?yàn)橛脩暨\(yùn)用程序還未編制,因而,程序容量在規(guī)劃階段是不知道的,需在程序調(diào)試之后才知道。為了規(guī)劃選型時(shí)能對(duì)程序容量有必定預(yù)算,通常選用存儲(chǔ)器容量的預(yù)算來(lái)替代。
存儲(chǔ)器內(nèi)存容量的預(yù)算沒(méi)有固定的公式,很多文獻(xiàn)資料中給出了不一樣公式,大體上都是按數(shù)字量I/O點(diǎn)數(shù)的10~15倍,加上模仿I/O點(diǎn)數(shù)的100倍,以此數(shù)為內(nèi)存的字?jǐn)?shù)(16位為一個(gè)字),另外再按此數(shù)的25%思考余量。
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