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heros2004
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樓主  發(fā)表于: 2011-01-04 18:27
s7-200   pid控制壓力


兩個(gè)模擬量輸入1、壓力變送器 4—20ｍａ　對應０—１ＭＰＡ
　　　　　　　　2、電動(dòng)調節閥反饋開(kāi)度信號4-20ma
一個(gè)模擬量輸出4—20ma，控制電動(dòng)調節閥開(kāi)度以達到控制電磁閥后壓力保持在0.45MPA左右。

電動(dòng)調節閥前壓力0.4—1mpa   要求閥后穩定在0.45MPa左右，誤差0.05MPA

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