2711-B5A8【】2711-B5A8
2711-B5A8【】2711-B5A81、plc模擬量輸進(jìn)模塊擴(kuò)展這里以一路12位模擬量輸進(jìn)為例,模擬信號(hào)以0~5V標(biāo)準(zhǔn)電壓的形式送進(jìn)信號(hào)輸進(jìn)端,應(yīng)用12位A/D轉(zhuǎn)換芯片MAX187實(shí)現(xiàn)模數(shù)轉(zhuǎn)換。MAX187是12位串行A/D,具有較高的轉(zhuǎn)換速度,采樣頻率是75kHz,適用于較高精度的過(guò)程控制??紤]到實(shí)際產(chǎn)業(yè)現(xiàn)場(chǎng)中的高頻干擾,在采樣信號(hào)送MAX187之前還使用了低通濾波器濾波,如圖1所示。
圖1 低通濾波、放大器及A/D轉(zhuǎn)換
MAX187具有內(nèi)部參考電壓,既4#管腳(REF)為 4.096V,因此,A/D轉(zhuǎn)換的全量程為4.096V。而輸進(jìn)信號(hào)是0~5V,因此,要加一級(jí)運(yùn)放把0~5V轉(zhuǎn)換成0~4.096V后送進(jìn)MAX187。AT89C52的P1.3和MAX187的片選端(CS)相連、AT89C52的P1.4和MAX187的串行時(shí)鐘信號(hào)端(SCLK)相連、AT89C52的P1.5和MAX187的串行數(shù)據(jù)輸出端(DOUT)相連。
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