1747-L543
開(kāi)關(guān)量輸入處理電路如圖2所示。電路開(kāi)關(guān)量由IN1～I(xiàn)N7輸入，通過(guò)光藕后產(chǎn)生IS1～I(xiàn)S7，并行信號(hào)IS1～I(xiàn)S7輸入到74HC165，通過(guò)74HC165將并行信號(hào)轉(zhuǎn)換為串行信號(hào)傳送給CPU。電阻R11～R18起到限流作用保護(hù)光耦中的二極管不被損壞。RS1～RS8是上拉電阻與電容CS～CS8配合使用既可以穩(wěn)定光耦輸出電平又可以在上電時(shí)對(duì)光耦起到保護(hù)作用。
圖2開(kāi)關(guān)量輸入電路
Fig.2Switchingbcircuit
1747-L543Fuji Inverter FRN2.2G1S-2J (FRN22G1S2J) NIB
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1747-L543
