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時間：2020-07-06作者：福建石屹科技有限公司瀏覽：103

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在可編程邏輯控制器系統(tǒng)設計時，首先應確定控制方案，下一步工作就是可編程邏輯控制器工程設計選型。工藝流程的特點和應用要求是設計選型的主要依據(jù)?？删幊踢壿嬁刂破骷坝嘘P設備應是集成的、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是在相關工業(yè)領域有投運業(yè)績、成熟可靠的系統(tǒng)，可編程邏輯控制器的系統(tǒng)硬件、軟件配置及功能應與裝置規(guī)模和控制要求相適應。熟悉可編程序控制器、功能表圖及有關的編程語言有利于縮短編程時間，因此，工程設計選型和估算時，應詳細分析工藝過程的特點、控制要求，明確控制任務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計相應的控制系統(tǒng)。
點數(shù)估算
I/O點數(shù)估算時應考慮適當?shù)挠嗔浚ǔ８鶕?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。設計階段，由于用戶應用程序還未編制，因此，程序容量在設計階段是未知的，需在程序調試之后才知道。為了設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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