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1756-EN2T/B工业模块
吞吐量实例在八通道模块上，2个通道低于范围。分配的所有寄存器至模块的数据将每1150ms更新一次，直到输入超出范围通道返回有效范围。当他们这样做时，更新间隔将返回到710毫秒。
更新间隔=（400或710）+（超出范围通道X 220）
使用上面的示例：（710）+（2 X 220）=1150毫秒
如果一个通道返回到有效范围，更新间隔将减少到930毫秒。注：只要通道超出范围，分配给它的寄存器将数据为0000（4095升高），低于范围，或4096（8192升高），高于范围范围（参考第176页的数据值参考图）
*更新间隔是更新所有分配给模块的寄存器。
注：任何模块运行时诊断故障都将导致0000值为返回到控制器，而不考虑所选范围。输入范围下表显示了每个输入范围可接受的五个输入范围组模块将接受高于其指定值2%的输入FSR范围，但不会进入超范围条件，但不会低于范围。
为了确定输入的负载和保护注意事项励磁电路，下图是输入电路前部的示意图终止注意内置250Ω 连接到电流输入端子的电阻器。
什么时候电流检测端子外部跨接至正极输入端子
无论电压范围如何，该输入都可能有电流输入所选数据更新周期是模块显示新数据所用的时间每个通道。对于四个输入电路，此周期不超过2.4ms；对于一个8输入电路配置，该周期不超过3.0ms。
自动校准内部自动校准过程在适当的时间执行（如有必要）以补偿前端漂移的信号处理。
自动校准功能采用反馈机制调整参考电压，以抵消模数转换器。校准在后台持续监控并在必要时进行调整。
下图显示了自动校准所有五个输入范围的点数。自动校准点由上的粗点表示坡度线。
自动校准过程使用10 V参考电压校准模块。
这个参考电压出厂时预设为10伏（归零至四位）。它应每年在该领域进行一次调整。
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 Ω 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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