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1C31232G02直流电压模块
B875–111和B877–111将在输入。模数转换的分辨率取决于输入使用配置开关组选择的范围和输出格式。使用Modicon编程器调用I/O中指定的相应寄存器地图改变输入信号，并检查寄存器内容是否正确变化。有关快速启动示例，请参阅下表。样品平均输入数据输出数据可以通过模块中的低通数字滤波器进行处理平均并消除转换后的输入模拟信号中的任何低频噪声
数据数字滤波算法为：哪里Xn=当前输入数据样本
Yn=新输出过滤器数据值Yn-1=先前输出过滤器数据值。
数字滤波算法近似于经典的指数响应与截止频率Fc和时间常数Tc相关的特性平均样本数N和吞吐量时间T
“N”为用户使用DIP开关选择（8,16,32）。吞吐量时间“T”等于10msB875–111和20ms，适用于B877–111。）与任何滤波器一样，用户必须确定时间常数和截止频率适用于特定应用。下面是一个参考表，大致如下各种用户设置的数字滤波器特性。应用在许多应用中，模拟信号以单位（点、，加仑/秒、摄氏度、英尺/分钟等）监视或报告打印输出。
模拟输入可以缩放为工程单位。
为了演示该技术，假设快速启动示例中的0-10 V信号
表示-40-+140°F的温度。请参阅下图显示信号与温度的关系。
信号与温度关系图工程单位范围是什么？在本例中，它是140-（-40）=180用计算器将这个数字除以7500。180/7500 = .024将此数字乘以10000，得到乘法块常数240。
将模拟输入乘以240。高阶结果寄存器将包含范围加上或减去Y截距（本例中为-40）以获得答案。校准工具模拟输入模块在出厂前进行校准。
为了确保根据模块精度，应每年定期校准微调罐。
校准模拟输入模块需要以下工具和材料：精度为0.0001 V、电压为10 V的精密数字读数伏特计规模一把1/8英寸的薄刃螺丝刀。
一把1/4英寸十字螺丝刀。一种粘合剂（如Loctite或Glyptol），用于固定装饰罐调整螺钉。
Module Checkout
The B875–111 and B877–111 will perform an analog to digital conversion on the inputs. The resolution of the analog to digital conversion is dependent upon the input range and output format selected with the configuration switch bank. Using a Modicon programmer, call up the appropriate registers assigned in the I/O Map. Vary the input signal and check that the register content varies correctly. Refer to the following table for the quick-start example. Sample Averaging Input Data The output data can be processed by a low-pass digital filter in the module to average out and remove any low-frequency noise in the converted input analog data. The digital filter algorithm is: where Xn = Current input data sample Yn = New output filter data value Yn-1 = Previous output filter data value. The digital filter algorithm approximates a classical exponential response characteristic with both the cut-off frequency, Fc, and the time constant, Tc, related to the number of samples to be averaged, N, and the throughput time, T. The "N" is user selected (8,16,32) with DIP-switches. Throughput time,"T", equals 10ms for the B875–111, and 20ms, for the B877–111.)As with any filter, the user must establish what time constant and cut-off frequency is suitable for the specific application. Below is a reference table that approximates the digital filter characteristics for various user settings.
Application
In many applications, analog signals are provided to operators in units (points, gallons per second, degrees C, feet per minute, etc.) via LED displays, CRT monitors or report printouts. An analog input can be scaled to engineering units. To illustrate the technique, assume that the0—10 V signal in the quick-start example represents a temperature from -40—+140°F. Refer to the following illustration showing the signal to temperature relationship. Signal to Temperature Relationship Diagram What is the engineering unit range? In this example it is 140 - (-40) =180 Divide this number by 7500 using a calculator. 180/7500 = .024 Multiply this number by 10,000 to obtain the multiply block constant of 240. Multiply the analog input by 240. The high-order result register will contain the range. Add or subtract the Y intercept (-40 in this example) to obtain the answer.Calibration Tools The analog input module is calibrated at the factory prior to shipment. To ensure the module’s accuracy, the trim-pot should be calibrated regularly on a yearly interval. The following tools and materials are needed to calibrate an analog input module: A precision digital readout voltmeter with an accuracy of 0.0001 V on a 10 V scale. A 1/8-inch bit, thin-blade screwdriver. A 1/4-inch Phillips-head screwdriver. An adhesive (such as Loctite or Glyptol) to secure trim-pot adjustment screws.
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