當(dāng)外部有信號(hào)輸入時(shí)，控制系統(tǒng)采集連續(xù)的N個(gè)脈沖使RS觸發(fā)器輸出為“1"，只有當(dāng)外部輸入信號(hào)由“1"變成“0"時(shí)，RS觸發(fā)器的復(fù)位端為“1"，將RS觸發(fā)器的輸出復(fù)位成“0"。而當(dāng)有瞬間干擾脈沖時(shí)，CON計(jì)數(shù)器將采集不到連續(xù)的N個(gè)脈沖，CON計(jì)數(shù)器無法輸出，這就起到了減少干擾的作用。（N一般情況下取2）
　優(yōu)點(diǎn)：響應(yīng)速度快，對(duì)周期性的瞬時(shí)干擾起到了一定的抑制作用。
3HAB2207-1

3HAB2207-1

 當(dāng)外部有信號(hào)輸入時(shí)，控制系統(tǒng)采集連續(xù)的N個(gè)脈沖使RS觸發(fā)器輸出為“1”，只有當(dāng)外部輸入信號(hào)由“1”變成“0”時(shí)，RS觸發(fā)器的復(fù)位端為“1”，將RS觸發(fā)器的輸出復(fù)位成“0”。而當(dāng)有瞬間干擾脈沖時(shí)，CON計(jì)數(shù)器將采集不到連續(xù)的N個(gè)脈沖，CON計(jì)數(shù)器無法輸出，這就起到了減少干擾的作用。（N一般情況下取2）
優(yōu)點(diǎn)：響應(yīng)速度快，對(duì)周期性的瞬時(shí)干擾起到了一定的抑制作用3HAB2207-1。
缺點(diǎn)：不能消除超過CON計(jì)數(shù)器采樣時(shí)間的干擾。
    除了CPU上集成的通訊接口外，每一個(gè)CPU上還可zui多擴(kuò)展4個(gè)通訊接口。這4個(gè)通訊接口可擴(kuò)展為任意的標(biāo)準(zhǔn)總線協(xié)議。
    CPU上集成的兩個(gè)Modbus通訊接口和可選集成的以太網(wǎng)或ARCNET網(wǎng)絡(luò)接口外，通過通訊擴(kuò)展接口還能擴(kuò)展：ProfibusDP-V1、DeviceNet、CANopen和以太網(wǎng)等總線接口。結(jié)構(gòu)
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