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产品详情内容介绍
382D719G06电源驱动器
I/O映射如果设置为8个差动输入，则模块类型为B875，需要8个连续3xxxx二进制寄存器。如果设置为16个单端输入，则模块类型为B877，需要16个连续的3xxxx二进制寄存器。
注：通电后，模块的活动指示灯快速闪烁，显示已建立与可编程控制器的通信，但返回的输入数据无效。（4000十六进制发送到控制器初始化期间）。模块初始化完成且输入有效时
当数据正在传输时，指示灯或稳定亮起，或缓慢闪烁任何输入都超出范围。导线输入B875–111和B877–111需要高密度连接器，零件号AS–8535–000。请参阅模块左侧的引出线。请参阅以下内容插图0-10 V输入示例。模块检查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。
使用程序员调用I/O映射中指定的相应寄存器。
变化输入信号，并检查寄存器内容是否正确变化。
快速启动示例请参阅下表。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
z工程单位范围是多少？在本例中，它是140-（-40）=180
z用计算器将这个数字除以7500。180/7500 = .024
z将此数字乘以10000，得到乘法块常数240。
z将模拟输入乘以240。高阶结果寄存器将包含范围z加上或减去Y截距（本例中为-40）以获得答案。
I/O Mapping
If setup for 8 differential inputs, the module type will be a B875 and requires 8 consecutive 3xxxx binary registers. If setup for 16 single ended inputs, the module type will be a B877 and require 16 consecutive 3xxxx binary registers. NOTE: Upon power-up the module’ s active indicator flashes rapidly showing that communication with the programmable controller has been established but, that the input data being returned is not valid. (4000 Hexadecimal is sent to the controller during the initialization time). When module initialization is complete, and valid input data is being transferred, the indicator is either steady on, or flashing slowly when any input is out-of-range. Wire Inputs The B875–111 and B877–111 require a high-density connector, part number AS– 8535–000. Refer to the left side of the module for pinouts. Refer to the following illustration. 0—10 V input example.
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 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.
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 z What is the engineering unit range? In this example it is 140 - (-40) =180 z Divide this number by 7500 using a calculator. 180/7500 = .024 z Multiply this number by 10,000 to obtain the multiply block constant of 240. z Multiply the analog input by 240. The high-order result register will contain the range. z Add or subtract the Y intercept (-40 in this example) to obtain the answer.
