| 品牌：其他 | 規格：C500-PS221 | 材質：C500-PS221 |
| 產地：日本 |
OMRON C500-PS221
OMRON C500-PS221
OMRON C500-PS221
（ 1 ）深入了解和分析被控對象的工藝條件和控制要求
a ．被控對象就是受控的機械、電氣設備、生產線或生產過程。
b ．控制要求主要指控制的基本方式、應完成的動作、自動工作循環的組成、必要的保護和聯鎖等。對較復雜的控制係統，還可將控制任務分成幾個部分，這種可化繁為簡，有利於編程和調試。
（ 2 ）確定 I/O 設備
根據被控對象對 PLC 控制係統的功能要求，確定係統所需的用戶輸入、輸出設備。常用的輸入設備有按鈕、選擇開關、行程開關、傳感器等，常用的輸出設備有繼電器、接觸器、指示燈、電磁閥等。
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