6ISA槽工業(yè)底板 CP-6SI;
供應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，首先應斷定控制計劃，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用請求是規(guī)劃選型的依據(jù)。PLC及有關設備應是集成的、規(guī)范的，按照易于與工業(yè)控制系統(tǒng)構成一個全體，易于擴大其功能的原則選型所選用PLC應是在有關工業(yè)范疇有投運成績、老練可靠的系統(tǒng)，PLC的系統(tǒng)硬件、軟件裝備及功能應與設備規(guī)劃和控制請求相慣。熟悉可編程序控制器、功能表圖及有關的編程言語有利于縮短編程時刻，因而，工程規(guī)劃選型和預算時，應詳細分析工藝進程的特色、控制請求，清晰控制使命和規(guī)模斷定所需的操作和動作，然后依據(jù)控制請求，預算輸入輸出點數(shù)、所需存儲器容量、斷定PLC的功能、外部設備特性等，*終挑選有較高性能報價比的PLC和規(guī)劃相應的控制系統(tǒng)。
　　一、輸入輸出(I/O)點數(shù)的預算
　　I/O點數(shù)預算時應思考適當?shù)挠嗔?，通常依?jù)計算的輸入輸出點數(shù)，再添加10%～20%的可拓展，余量后，作為輸入輸出點數(shù)預算數(shù)據(jù)。實踐訂購時，還需依據(jù)制造廠商PLC的商品特色，對輸入輸出點數(shù)進行圓整。
　　二、存儲器容量的預算
　　存儲器容量是可編程序控制器自身能供給的硬件存儲單元巨細，程序容量是存儲器中用戶運用項目運用的存儲單元的巨細，因而程序容量小于存儲器容量。規(guī)劃階段，因為用戶運用程序還未編制，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)劃選型時能對程序容量有必定預算，通常選用存儲器容量的預算來替代。
　　存儲器內(nèi)存容量的預算沒有固定的公式，很多文獻資料中給出了不一樣公式，大體上都是按數(shù)字量I/O點數(shù)的10～15倍，加上模仿I/O點數(shù)的100倍，以此數(shù)為內(nèi)存的字數(shù)(16位為一個字)，另外再按此數(shù)的25%思考余量。




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