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S7-EM239專為S7-200PLC配套設(shè)計(jì)，通過RS485接口連接S7-200系列任何型號(hào)的CPU，實(shí)現(xiàn)多通道模擬量采集，補(bǔ)充S7-200模擬量通道少、價(jià)格高的不足。R88M-H30030 AC300W每個(gè)CPU最多可以連接32個(gè)S7-239模塊，模擬數(shù)量最多為512點(diǎn)。
S7-239模塊為16路模擬量采集一線通模塊，可采集電壓、電流、毫伏、各種類型熱電阻溫度、各種類型熱電偶溫度，通道類型隨意組合。采用RS485通訊接口和MODBUS-RTU，直接連接S7-200系列的CPU，外形尺寸和顏色與SIEMENS S7-200相同。
R88M-H30030 AC300W輸入通道采用雙端差動(dòng)輸入。輸入、電源、網(wǎng)絡(luò)及通道之間電氣隔離，有效抑制各類共模干擾，消除通道間的相互影響。每個(gè)通道的信號(hào)類型可以任意設(shè)置。
熱電阻、熱電偶輸入有斷路檢測功能，采集結(jié)果為溫度值，熱電偶輸入自動(dòng)進(jìn)行冷端溫度補(bǔ)償。
一線通模塊具有一階數(shù)字濾波、50Hz工頻抑制功能，對(duì)抑制工業(yè)現(xiàn)場的工頻干擾十分有效，保證微弱信號(hào)的采集精度，同時(shí)，R88M-H30030 AC300W一線通模塊具有自動(dòng)校準(zhǔn)、系統(tǒng)校準(zhǔn)功能，隨時(shí)修正由于環(huán)境溫度變化引起的測量誤差，保證一線通模塊在整個(gè)工作溫度范圍內(nèi)的采集精度。
S7-EM239主要用于溫度采集以及多種輸入信號(hào)類型并存的應(yīng)用場合。
網(wǎng)絡(luò)連接
S7-EM239模塊通過RS485接口與S7-200CPU連接，每個(gè)CPU可以連接32個(gè)S7-EM239模塊，網(wǎng)絡(luò)連接如圖1所示。
所有S7-EM239模塊為從機(jī)設(shè)備。

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