6SE7016-1EA61
6SE7016-1EA61
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模擬量模塊的設(shè)計(jì) 3.1 模擬量模塊的設(shè)置 在洗梗機(jī)水分控制部分中,選用SM331,模擬量輸入模塊是將模擬信號轉(zhuǎn)換為CPU內(nèi)部處理用的數(shù)字信號,其主要組成是A/D轉(zhuǎn)換器。一般模擬由變送器輸出標(biāo)準(zhǔn)直流電壓、直流電流信號。SM331可以直接連接不帶變送器的溫度傳感器,這樣不用溫度變送器,不但節(jié)約硬件成本,而且減少故障點(diǎn)。但直接連接傳感器需要對測量范圍進(jìn)行設(shè)置。S7331-7KFO2-OABO模擬量模塊的輸入類型用模塊側(cè)面的量程卡來設(shè)置。量程卡安裝在模擬模塊側(cè)面,每2個(gè)通道一組,8個(gè)通道4個(gè)量程卡,當(dāng)設(shè)定為溫度時(shí),2個(gè)通道為1路輸入。供貨時(shí)通常設(shè)置在默認(rèn)的B位置(±10V)。需要設(shè)定3路溫度檢測,根據(jù)資料A為溫度傳感器輸入。所以使用改錐,將量程卡從模擬量輸入模塊中松開,再將量程卡選好位置A指向模塊標(biāo)記點(diǎn),插入量程卡。系統(tǒng)將3塊量程卡設(shè)為A,第四塊不變?nèi)詾锽,這樣完成3路溫度、2路電壓輸入的量程卡設(shè)置。硬件設(shè)置完后要進(jìn)行聯(lián)機(jī)進(jìn)入STEP7中硬件設(shè)置中選擇模擬量量程,具體STEP7中模擬量輸入模塊量程。
模擬值模塊轉(zhuǎn)換、循環(huán)和響應(yīng)時(shí)間 轉(zhuǎn)換時(shí)間由基本轉(zhuǎn)換時(shí)問和模塊的測試及監(jiān)控處理時(shí)間組成?;巨D(zhuǎn)換時(shí)間直接取決于模擬量輸入模塊的轉(zhuǎn)換方法(積分方法,瞬時(shí)值轉(zhuǎn)換)。模擬量輸入通道的掃描時(shí)間,即模擬量輸入值本次轉(zhuǎn)換到下一次轉(zhuǎn)換時(shí)所經(jīng)歷的時(shí)間,是指模擬量輸入模塊的所有激活模擬量輸入通道的轉(zhuǎn)換時(shí)間總和。模擬量輸出通道的轉(zhuǎn)換時(shí)間由兩部分組成:數(shù)字量數(shù)值從CPU存儲器傳送到輸出模塊的時(shí)問和模擬量模塊的數(shù)一模轉(zhuǎn)換時(shí)間。模擬量輸出通道也是順序轉(zhuǎn)換,即模擬量輸出通道依次轉(zhuǎn)換。掃描時(shí)間,即模擬量輸出值本次轉(zhuǎn)換到再次轉(zhuǎn)換時(shí)所經(jīng)歷的時(shí)間,是指模擬量輸出模塊的所有激活的模擬量輸出通道的轉(zhuǎn)換時(shí)間總和,所以可以通過在STEP7中禁用所有沒有使用的模擬量通道,來降低I/O掃描時(shí)間。
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