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vickygl
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樓主  發(fā)表于: 2016-05-26 09:00
有個(gè)疑問(wèn)請教大家:
S7-200 CN CPU224 CN  DC/DC/DC (214-1AD23-0XB8) 這款應該是晶閘管輸出型,以前我做過(guò)的控制方式,都是用輸出接中間繼電器線(xiàn)圈,再由繼電器的通斷來(lái)控制電磁閥的上電問(wèn)題。
現在有個(gè)疑問(wèn),它的輸出也是24V,不知道能不能直接給8個(gè)“ DC24V 2.5W”的電磁閥直接供電?
八百橋
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1樓  發(fā)表于: 2016-05-26 18:06
晶體管輸出的PLC,其輸出電流為0.75A,其帶的負載不能超出其范圍,你算一下每個(gè)輸出點(diǎn)負載電流是多少?你的電磁閥是24VDC,2.5W,電流應為0.1A,按道理是可以驅動(dòng)的,但是建議plc輸出控制中間繼電器,然后用繼電器驅動(dòng)電磁閥,由于電磁閥工作時(shí)會(huì )產(chǎn)生反電動(dòng)勢,所以這樣考慮,最好在電磁閥兩端并聯(lián)電容,以上僅供參考

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