6ES5430-4UA13

HP57A6

一般I／O模塊的價(jià)格占PLC價(jià)格的一半以上。PLC的I／O模塊有開關(guān)量I／O模塊、模擬量I／O模塊及各種特殊功能模塊等。不同的I／O模塊，其電路及功能也不同，直接影響PLC的應(yīng)用范圍和價(jià)格，應(yīng)當(dāng)根據(jù)實(shí)際需要加以選擇。開關(guān)量輸入模塊是用來接收現(xiàn)場(chǎng)輸入設(shè)備的開關(guān)信號(hào)，將信號(hào)轉(zhuǎn)換為PLC內(nèi)部接受的低電壓信號(hào)，并實(shí)現(xiàn)PLC內(nèi)、外信號(hào)的電氣隔離。選擇時(shí)主要應(yīng)考慮以下幾個(gè)方面：開關(guān)量輸入模塊有直流輸入、交流輸入和交流／直流輸入三種類型。選擇時(shí)主要根據(jù)現(xiàn)場(chǎng)輸入信號(hào)和周圍環(huán)境因素等。直流輸入模塊的延遲時(shí)間較短，還可以直接與接近開關(guān)、光電開關(guān)等電子輸入設(shè)備連接；交流輸入模塊可靠性好，適合于有油霧、粉塵的惡劣環(huán)境下使用。

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