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時間：2020-07-06作者：福建石屹科技有限公司瀏覽：97

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在可編程邏輯控制器系統(tǒng)設(shè)計時，首先應(yīng)確定控制方案，下一步工作就是可編程邏輯控制器工程設(shè)計選型。工藝流程的特點和應(yīng)用要求是設(shè)計選型的主要依據(jù)?？删幊踢壿嬁刂破骷坝嘘P(guān)設(shè)備應(yīng)是集成的、標準的，按照易于與工業(yè)控制系統(tǒng)形成一個整體，易于擴充其功能的原則選型所選用可編程邏輯控制器應(yīng)是在相關(guān)工業(yè)領(lǐng)域有投運業(yè)績、成熟可靠的系統(tǒng)，可編程邏輯控制器的系統(tǒng)硬件、軟件配置及功能應(yīng)與裝置規(guī)模和控制要求相適應(yīng)。熟悉可編程序控制器、功能表圖及有關(guān)的編程語言有利于縮短編程時間，因此，工程設(shè)計選型和估算時，應(yīng)詳細分析工藝過程的特點、控制要求，明確控制任務(wù)和范圍確定所需的操作和動作，然后根據(jù)控制要求，估算輸入輸出點數(shù)、所需存儲器容量、確定可編程邏輯控制器的功能、外部設(shè)備特性等，最后選擇有較高性能價格比的可編程邏輯控制器和設(shè)計相應(yīng)的控制系統(tǒng)。
點數(shù)估算
I/O點數(shù)估算時應(yīng)考慮適當?shù)挠嗔?，通常根?jù)統(tǒng)計的輸入輸出點數(shù)，再增加10%～20%的可擴展余量后，作為輸入輸出點數(shù)估算數(shù)據(jù)。實際訂貨時，還需根據(jù)制造廠商可編程邏輯控制器的產(chǎn)品特點，對輸入輸出點數(shù)進行圓整。 
存儲器容量
存儲器容量是可編程序控制器本身能提供的硬件存儲單元大小，程序容量是存儲器中用戶應(yīng)用項目使用的存儲單元的大小，因此程序容量小于存儲器容量。設(shè)計階段，由于用戶應(yīng)用程序還未編制，因此，程序容量在設(shè)計階段是未知的，需在程序調(diào)試之后才知道。為了設(shè)計選型時能對程序容量有一定估算，通常采用存儲器容量的估算來替代。
存儲器內(nèi)存容量的估算沒有固定的公式，許多文獻資料中給出了不同公式，大體上都是按數(shù)字量I/O點數(shù)的10～15倍，加上模擬I/O點數(shù)的100倍，以此數(shù)為內(nèi)存的總字數(shù)（16位為一個字），另外再按此數(shù)的25%考慮余量。
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