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廈門泰尼電氣有限公司
主營(yíng)產(chǎn)品： AB模塊PLC |
會(huì)員1.png)
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廈門泰尼電氣有限公司
主營(yíng)產(chǎn)品： AB模塊PLC |
| 參考價(jià) | 面議 |
聯(lián)系方式：張亮查看聯(lián)系方式
更新時(shí)間：2015-03-05 11:19:13瀏覽次數(shù)：131
聯(lián)系我們時(shí)請(qǐng)說明是泵閥商務(wù)網(wǎng)上看到的信息，謝謝!
140CHS41010---140CHS41010
140CHS41010---140CHS41010
方案中使用光耦隔離主要還是想保護(hù)PLC，在電磁閥短斷時(shí)，保險(xiǎn)
電阻Ω22可能也不可靠，但zui壞的結(jié)果是燒開關(guān)管TIP。方案中使用光耦隔離主要還是想保護(hù)PLC，在電磁閥短斷時(shí)，保險(xiǎn)電阻Ω22可能也不可靠，但zui壞的結(jié)果是燒開關(guān)管TIP。……
答：將上面我畫的電路改為放大器形式，當(dāng)電磁閥線圈短路時(shí)，就不會(huì)燒毀PLC的輸出口，其原因：短路時(shí)R2成仍為PLC輸出負(fù)載（10K）(電流僅為2.4mA)。此時(shí)由于線圈短路產(chǎn)生過大的短路電流會(huì)危害24V電源的，為此可采用如下2種電路起過流斷電保護(hù)作用：
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