RELIANCE 57401模塊
校準(zhǔn)過程中，驗證模式可用，以查看整個校準(zhǔn)范圍內(nèi)的模擬輸入（以伏特為單位）。這個
輸入為1-5 Vdc的出廠校準(zhǔn)，不需要現(xiàn)場校準(zhǔn)。然而，現(xiàn)場校準(zhǔn)可以是如果需要另一個范圍或匹配精確的變送器校準(zhǔn)，則執(zhí)行。當(dāng)前輸入為：使用連接在輸入端子（250? 提供電阻器控制器用于轉(zhuǎn)換4-20mA輸入）。
通電-在熱啟動、熱啟動或冷啟動期間，功能塊將暫時旁路數(shù)字濾波器，以使輸出在實際硬件輸入信號處初始化。3.2.10 AINU_-模擬輸入，通用AINU_功能塊在可選I/O上可用擴展器板。這些功能塊轉(zhuǎn)換傳感器輸入
例如T/C（熱電偶）、RTD（電阻溫度探測器）、毫伏、歐姆和滑入塊的電源輸出。電流輸入（即4-20 mA）通過以下方式調(diào)節(jié)：使用WMV類型并連接3.75? 跨接電阻器輸入。輸出偏置可用于消除任何已知的傳感器電路和數(shù)字濾波器中的偏移（時間常數(shù)）
以抑制工藝噪聲。輸出QS指示輸出信號O1的質(zhì)量狀態(tài)將變高
當(dāng)輸出質(zhì)量差時。質(zhì)量差表示A/D轉(zhuǎn)換故障或T/C開路或輸出過程變量的范圍。
縮放函數(shù)用于建立輸出范圍，在所選傳感器范圍的工程單位（例如0-10 mv或50.0-150.0安培）。直接溫度測量（即T/C和RTD）旁通傳感器和量程縮放以及從表3.4中選擇塊輸出單位。當(dāng)選擇，正確的只讀ASCII字符
與所選類型相對應(yīng)的單位將自動為：置于發(fā)動機單位參數(shù)中。當(dāng)選擇歐姆或MVs時，發(fā)動機單位參數(shù)可以為
被配置為對應(yīng)于過程工程單元。默認的SEN、MIN和MIN刻度設(shè)置為最小操作值和SEN最大和最大刻度設(shè)置為最大操作值。森敏&SEN MAX始終以攝氏度表示傳感器范圍限制。但是，輸入實際值很重要
MINSCALE、MAXSCALE和DPP參數(shù)中的預(yù)期工作范圍，以便其他功能塊，如作為控制器，操作員面板和工作站界面可以指向該塊進行范圍和顯示信息塊名稱（ID）。第8.4節(jié)列出了輸入端子（端子號）。
3.2.10 AINU_ - Analog Inputs, Universal AINU_ function blocks are available on the optional I/O Expander Board. These function blocks convert sensor inputs such as T/C (thermocouple), RTD (resistance temperature detector), millivolt, ohm, and slidewire sources into block outputs. Current inputs (i.e. 4-20 mA) are accommodated by using the WMV type and connecting a 3.75? resistor across the input. An output bias can be used to nullify any known offset in the sensor circuit and a digital filter (time constant) is included, to dampen process noise. Output QS indicates the quality status of the output signal O1 and will go high (1) when the output is of bad quality. Bad quality indicates an A/D conversion failure or an open circuit T/C, or an out of range process variable. The scaling function is used to establish an output range, in engineering units, for the selected sensor range (e.g. 0-10 mv or 50.0-150.0 amperes). Direct Temperature Measurements (i.e. T/C and RTD) bypass sensor and range scaling and the block output units are selected from Table 3.4. When selected, the proper read only ASCII characters corresponding to the type units selected will automatically be placed in the ENG UNITS parameter. When OHMs or MVs are selected, the ENG UNITS parameter can be configured to correspond to the process engineering units. The default SEN MIN and MIN SCALE are set to the minimum operating value and the SEN MAX & MAX SCALE are set to the maximum operating value. SEN MIN & SEN MAX always indicate the sensor range limits in degrees C. However, it is important to enter the actual intended operating range in the MINSCALE, MAXSCALE, and DPP parameters so that other function blocks, such as the controller, operator faceplate, and workstation interface, can point to this block for range and display informationBlock names (IDs). Input terminations (terminal numbers) are listed in Section 8.4.
