產(chǎn)品內(nèi)容介紹
1756-EN2T/B工業(yè)模塊
吞吐量實(shí)例在八通道模塊上，2個(gè)通道低于范圍。分配的所有寄存器至模塊的數(shù)據(jù)將每1150ms更新一次，直到輸入超出范圍通道返回有效范圍。當(dāng)他們這樣做時(shí)，更新間隔將返回到710毫秒。
更新間隔=（400或710）+（超出范圍通道X 220）
使用上面的示例：（710）+（2 X 220）=1150毫秒
如果一個(gè)通道返回到有效范圍，更新間隔將減少到930毫秒。注：只要通道超出范圍，分配給它的寄存器將數(shù)據(jù)為0000（4095升高），低于范圍，或4096（8192升高），高于范圍范圍（參考第176頁(yè)的數(shù)據(jù)值參考圖）
*更新間隔是更新所有分配給模塊的寄存器。
注：任何模塊運(yùn)行時(shí)診斷故障都將導(dǎo)致0000值為返回到控制器，而不考慮所選范圍。輸入范圍下表顯示了每個(gè)輸入范圍可接受的五個(gè)輸入范圍組模塊將接受高于其指定值2%的輸入FSR范圍，但不會(huì)進(jìn)入超范圍條件，但不會(huì)低于范圍。
為了確定輸入的負(fù)載和保護(hù)注意事項(xiàng)勵(lì)磁電路，下圖是輸入電路前部的示意圖終止注意內(nèi)置250? 連接到電流輸入端子的電阻器。
什么時(shí)候電流檢測(cè)端子外部跨接至正極輸入端子
無論電壓范圍如何，該輸入都可能有電流輸入所選數(shù)據(jù)更新周期是模塊顯示新數(shù)據(jù)所用的時(shí)間每個(gè)通道。對(duì)于四個(gè)輸入電路，此周期不超過2.4ms；對(duì)于一個(gè)8輸入電路配置，該周期不超過3.0ms。
自動(dòng)校準(zhǔn)內(nèi)部自動(dòng)校準(zhǔn)過程在適當(dāng)?shù)臅r(shí)間執(zhí)行（如有必要）以補(bǔ)償前端漂移的信號(hào)處理。
自動(dòng)校準(zhǔn)功能采用反饋機(jī)制調(diào)整參考電壓，以抵消模數(shù)轉(zhuǎn)換器。校準(zhǔn)在后臺(tái)持續(xù)監(jiān)控并在必要時(shí)進(jìn)行調(diào)整。
下圖顯示了自動(dòng)校準(zhǔn)所有五個(gè)輸入范圍的點(diǎn)數(shù)。自動(dòng)校準(zhǔn)點(diǎn)由上的粗點(diǎn)表示坡度線。
自動(dòng)校準(zhǔn)過程使用10 V參考電壓校準(zhǔn)模塊。
這個(gè)參考電壓出廠時(shí)預(yù)設(shè)為10伏（歸零至四位）。它應(yīng)每年在該領(lǐng)域進(jìn)行一次調(diào)整。
Throughput Rate Example
On an eight channel module, 2 channels are under range. All the registers assigned to the module will be updated every 1150ms, until the inputs on the out of range channels return to the valid range. When they do, the update interval will return to 710ms. Update Interval = (400 or 710) + (Out of Range Channels X 220) Using the example above: (710) + (2 X 220) = 1150ms If one channel returned to the valid range, the update interval would reduce to 930ms.Note: As long as the channel is out of range, the register assigned to it will either have data of 0000 (4095 Elevated), under range, or 4096 (8192 Elevated), over range. (Refer to Data Value Reference Chart, p. 176) * The Update Interval is the amount of time necessary to update the data for all the registers assigned to the module. Note: Any module run-time diagnostic failure will result in a 0000 value being returned to the controller, regardless of selected range.
Input Ranges
The following table shows the five input ranges acceptable to each input range group. The module will accept an input as much as 2% FSR above its specified range without going into an over-range condition, but nothing below range. For purposes of determining load and protection considerations for the inputting of field circuits, The following figure is a schematic diagram of the input circuit’s front end. Note the built-in 250 ? resistor connected to the current input terminal. When the current sense terminal is externally jumpered to the positive input terminal, current input becomes possible for that input regardless of the voltage range selected The data update period is the time taken by the module to present fresh data for each channel. With four input circuits, this period is no more than 2.4 ms; for an eight input circuit configuration, this period is no more than 3.0 ms. Autocalibration An internal autocalibration process is executed at appropriate times (if necessary) to compensate signal processing for front end drift. The autocalibration function employs feedback mechanisms to adjust the reference voltage to offset gain in the analog to digital converter. Calibration is monitored continuously in the background and adjusted if and when necessary. The following figure shows autocalibration points for all five input ranges. Autocalibration points are indicated by heavy dots on slope line. The autocalibration process uses the 10 V reference to calibrate the module. The reference voltage is factory preset to exactly 10 volts (zeroed to four places). It should be readjusted in the field once per year.
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