C9900-U209

C9900-U209

PLC控制著一個復雜系統，所能看到的是上下兩排錯開的輸入輸出繼電器接線端子、對應的指示燈及PLC編號，就像一塊有數十只腳的集成電路。任何一個人如果不看原理圖來檢修故障設備，會束手無策，查找故障的速度會特別慢。鑒于這種情況，我們宜根據電氣原理圖繪制一張表格，貼在設備的控制臺或控制柜上，標明每個PLC輸入輸出端子編號與之相對應的電器符號，中文名稱，即類似集成電路各管腳的功能說明。

有了這張輸入輸出表格，對于了解操作過程或熟悉本設備梯形圖的電工就可以展開檢修了。但對于那些對操作過程不熟悉，不會看梯形圖的電工來說，就需要再繪制一張表格：PLC輸入輸出邏輯功能表。該表實際說明了大部分操作過程中輸入回路（觸發元件、關聯元件）和輸出回路（執行元件）的邏輯對應關系。實踐證明如果你能熟練利用輸入輸出對應表及輸入輸出邏輯功能表，檢修電氣故障，不帶圖紙，也能輕松自如。

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