6ISA槽工業底板 CP-6SI;
供應6ISA槽工業底板 CP-6SI;
6ISA槽工業底板 CP-6SI;


在PLC系統規劃時，首先應斷定控制計劃，下一步作業即是PLC工程規劃選型。工藝流程的特色和運用請求是規劃選型的依據。PLC及有關設備應是集成的、規范的，按照易于與工業控制系統構成一個全體，易于擴大其功能的原則選型所選用PLC應是在有關工業范疇有投運成績、老練可靠的系統，PLC的系統硬件、軟件裝備及功能應與設備規劃和控制請求相慣。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，清晰控制使命和規模斷定所需的操作和動作，然后依據控制請求，預算輸入輸出點數、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和規劃相應的控制系統。
　　一、輸入輸出(I/O)點數的預算
　　I/O點數預算時應思考適當的余量，通常依據計算的輸入輸出點數，再添加10%～20%的可拓展，余量后，作為輸入輸出點數預算數據。實踐訂購時，還需依據制造廠商PLC的商品特色，對輸入輸出點數進行圓整。
　　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。規劃階段，因為用戶運用程序還未編制，因而，程序容量在規劃階段是不知道的，需在程序調試之后才知道。為了規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，大體上都是按數字量I/O點數的10～15倍，加上模仿I/O點數的100倍，以此數為內存的字數(16位為一個字)，另外再按此數的25%思考余量。




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