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AB 6181F-17TPXPH

（ 4 ）分配 I/O 點 分配 PLC 的輸入輸出點，編制出輸入 / 輸出分配表或者畫出輸入 / 輸出端子的接線圖。接著九可以進行 PLC 程序設計，同時可進行控制 柜或操作臺的設計和現場施工。 （ 5 ）設計應用系統梯形圖程序 根據工作功能圖表或狀態流程圖等設計出梯形圖即編程。這一步是整個 應用系統設計的最核心工作，也是比較困難的一步，要設計好梯形圖， 首先要十分熟悉控制要求，同時還要有一定的電氣設計的實踐經驗。

AB 6181F-17TPXPH

聯系人：郭先生
聯系電話：18971415643《優先》
座機：027-83238871
傳真：207-61537051
QQ：810334512《優先》

AB 6181F-17TPXPH

(三)電源的選擇 PLC的供電電源，除了引進設備時同時引進PLC應根據產品說明書要 求設計和選用外，一般PLC的供電電源應設計選用220VAC電源，與國內 電網電壓一致。重要的應用場合，應采用不間斷電源或穩壓電源供電。 如果PLC本身帶有可使用電源時，應核對提供的電流是否滿足應用 要求，否則應設計外接供電電源。為防止外部高壓電源因誤操作而引入 PLC，對輸入和輸出信號的隔離是必要的，有時也可采用簡單的二極管 或熔絲管隔離。

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