1）對于繼電器這類電感性負載，必須安裝火花抑制器。
2）對于容性負載，應在信號輸出負載線路中串聯(lián)限流電阻。電阻阻值應確保負載承受的瞬時電流和電壓被限制在額定值內(nèi)。
3）在用晶體管輸出直接驅(qū)動指示燈時，沖擊電流可能損壞晶體管。為此應設置保護電阻以防晶體管被擊穿。
4）當被驅(qū)動負載是電磁開關、電磁離合器、電磁閥線圈等交流負載，或雖是直流負載，但工作電壓或工作電流超過輸出信號的工作范圍時，應先用輸出信號驅(qū)動小型中間繼電器（一般工作電壓＋24V），然后用它們的觸點接通強電線路的功率繼電器或直接去激勵這些負載（見圖1）。當然，如果所用PLC裝置本身具有交流輸入、輸出信號接口，或有用于直流大負載驅(qū)動的專用接口時，輸出信號就不必經(jīng)中間繼電器過渡，即可以直接驅(qū)動負載器件。
武漢路易達自動化設備有限公司
聯(lián)系人：李先生
電話：18971414423
固話：027-83238817
傳真：027-61537051
QQ:505528191
地址：武漢市東西湖區(qū)走馬嶺匯通公路港信息交易中
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