990XCA65609在PLC輸出類型選擇和使用時(shí)應(yīng)注意以下幾點(diǎn)：
 
　　（1）一定要關(guān)注負(fù)載容量。輸出端口須遵守允許大電流限制（如表1所示），以保證輸出端口的發(fā)熱限制在允許范圍。繼電器的使用壽命與負(fù)載容量有關(guān)，當(dāng)負(fù)載容量增加時(shí)，觸點(diǎn)壽命將大大降低（如表2所示），因此要特別關(guān)注。
　　（2）一定要關(guān)注負(fù)載性質(zhì)。根據(jù)第4節(jié)的分析，感性負(fù)載在開(kāi)合瞬間會(huì)產(chǎn)生瞬間高壓，因此表面上看負(fù)載容量可能并不大，但是實(shí)際上負(fù)載容量很大，繼電器的壽命將大大縮短，因此當(dāng)驅(qū)動(dòng)感性負(fù)載時(shí)應(yīng)在負(fù)載兩端接入吸收保護(hù)電路。尤其在工作頻率比較高時(shí)務(wù)必增加保護(hù)電路。從客戶的使用情況來(lái)看，增加吸收保護(hù)電路后的改善效果十分明顯。
　　根據(jù)電容的特性，如果直接驅(qū)動(dòng)電容負(fù)載，在導(dǎo)通瞬間將產(chǎn)生沖擊浪涌電流，因此原則上輸出端口不宜接入容性負(fù)載，若有必要，需保證其沖擊浪涌電流小于規(guī)格（見(jiàn)表1）說(shuō)明中的大電流。
　　（3）一定要關(guān)注動(dòng)作頻率。當(dāng)動(dòng)作頻率較高時(shí)，建議選擇晶體管輸出類型，如果同時(shí)還要驅(qū)動(dòng)大電流則可以使用晶體管輸出驅(qū)動(dòng)中間繼電器的模式。當(dāng)控制步進(jìn)電機(jī)/伺服系統(tǒng)，或者用到高速輸出/PWM波，或者用于動(dòng)作頻率高的節(jié)點(diǎn)等場(chǎng)合，只能選用晶體管型。PLC對(duì)擴(kuò)展模塊與主模塊的輸出類型并不要求一致，因此當(dāng)系統(tǒng)點(diǎn)數(shù)較多而功能各異時(shí)，可以考慮繼電器輸出的主模塊擴(kuò)展晶體管輸出或晶體管輸出主模塊擴(kuò)展繼電器輸出以達(dá)到配合。

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慧星公司是一家性的貿(mào)易型企業(yè)，主要供應(yīng):A-B 1756 PLC \1747 PLC\1746 PLC \1771老PLC\1769小型PLC\1785\2711觸摸屏 等系列。

西門子：高壓斷路器，過(guò)載繼電器，熱繼電器，S7-200,S7-300,S7-500,6DD,6AV,6GK等系列

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