供應(yīng)Allen-Bradley（羅克韋爾）1794-IM16 冗余模塊
一）分析被控對象并提出控制要求
詳細分析被控對象的工藝過程及工作特點，了解被控對象機、電、液之間的配合，提出被控對象對PLC控制系統(tǒng)的控制要求，確定控制方案，擬定設(shè)計任務(wù)書。
（二）確定輸入／輸出設(shè)備
根據(jù)系統(tǒng)的控制要求，確定系統(tǒng)所需的全部輸入設(shè)備（如：按紐、位置開關(guān)、轉(zhuǎn)換開關(guān)及各種傳感器等）和輸出設(shè)備（如：接觸器、電磁閥、信號指示燈及其它執(zhí)行器等），從而確定與PLC有關(guān)的輸入/輸出設(shè)備，以確定PLC的I/O點數(shù)。
（三）選擇PLC
PLC選擇包括對PLC的機型、容量、I/O模塊、電源等的選擇，詳見本章第二節(jié)。
（四）分配I/O點并設(shè)計PLC外圍硬件線路
1.分配I/O點
畫出PLC的I/O點與輸入／輸出設(shè)備的連接圖或?qū)?yīng)關(guān)系表，該部分也可在第２步中進行。
2.設(shè)計PLC外圍硬件線路
畫出系統(tǒng)其它部分的電氣線路圖，包括主電路和未進入可編程控制器的控制電路等。
由PLC的I/O連接圖和PLC外圍電氣線路圖組成系統(tǒng)的電氣原理圖。到此為止系統(tǒng)的硬件電氣線路已經(jīng)確定。
供應(yīng)Allen-Bradley（羅克韋爾）1794-IM16 冗余模塊
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供應(yīng)Allen-Bradley（羅克韋爾）1794-IM16 冗余模塊
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供應(yīng)Allen-Bradley（羅克韋爾）1794-IM16 冗余模塊
長期以來，硬件開發(fā)人員在制作原型之前一直依賴仿真環(huán)境來設(shè)計硬件。使用軟件驅(qū)動的仿真器或數(shù)字孿生使他們能夠?qū)φ找阎牧己脜⒖枷到y(tǒng)來衡量不同操作環(huán)境、條件和協(xié)議演變的影響，從而減少設(shè)計迭代次數(shù)。同樣，軟件開發(fā)人員使用 Scrum 等方法并在虛擬仿真過程中進行測試，也能逐步構(gòu)建和部署新特性，如此也有助于減少設(shè)計迭代次數(shù)。
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