?。ㄒ唬┓治霰豢貙ο蟛⑻岢隹刂埔?/span>

　　詳細(xì)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。

　?。ǘ┐_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)。

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