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樓主  發(fā)表于: 2011-04-18 15:10
小弟是新手，剛接觸西門(mén)子PLC，最近調試模擬量輸入模塊（SM331 8X12），問(wèn)幾個(gè)菜鳥(niǎo)的問(wèn)題
1:測量方式中 R-4L和RT是什么時(shí)候使用
2;熱電阻溫度傳感器可以直接接入PLC么，接入時(shí)測量方式選什么
3，我看二線(xiàn)制接法，有時(shí)候需要模塊供電，有時(shí)候不需要，怎么判斷呢？
4，暫時(shí)沒(méi)有標準電流輸出的變送器，想用電阻模擬個(gè)電流出來(lái)，接入電路，量程總是超，用萬(wàn)用表打完后發(fā)現根本沒(méi)有電流，為什么？
各位大俠，謝謝嘍!

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