产品内容介绍
1756-RM/A直流电源模块
特征B875–111模拟模数（A/D）输入模块（B875）转换输入电压和/或输入电流范围转换为二进制数据。此模块可以配置接受8个差分或16个单端输入。当为8个差速器选择时输入，该卡称为B875–111。当为16个单端输入选择时该卡名为B877–111。请参阅下面的简化示意图。
B875模拟输入模块允许广泛的现场设备轮询根据不同的应用需要不同的电压和电流。
可以在模块范围内从五个可用输入电压范围中进行选择。这个范围为0至5V、1至5V，-5至5V和0至10V，-10至10V通过模块配置开关上的四个DIP开关。
可以从三个可用的输入电流范围中进行选择，即0至20 mA、4至20 mA和-20至+20 mA。
可以从四种可用的输出格式中进行选择。
格式是标准的，通过打开两个DIP开关选择提升、全分辨率和十进制模块配置开关。
可以选择不求平均值，也可以选择要求平均值的8、16或32个样本输入通过模块上的两个DIP开关生成每个输出配置开关。
该模块有8/16个模拟输入，能够更新所有地震道每10-20毫秒。大于12位的分辨率和绝对0-60°C时的精度为0.1%，可精确控制应用。B875-111模块出厂时电压范围为1-5 V，0-4095输出格式（标准），一个平均采样，电压输入，8通道（B875-111）–即所有DIP开关都向右。如有必要，重置模块配置开关和基于应用的五位DIP开关安装前的要求。
请参阅下面的模块配置开关图示。
单元配置带DIP的开关
下图显示了模块配置开关和DIP开关B875–111模块的设置。
B875–111模拟输入模块、模块配置开关和DIP开关
设置标准输出格式为原始二进制输出，0-4095计数。低于范围为0000超范围为4096。
提升输出格式为原始二进制输出，计数为4096-8191。低于范围为4095及以上范围为8192。
全分辨率输出格式提供了模块的真实分辨率取决于输入范围。
双极输入产生0001-14999计数的输出
单极输入产生0001-7499计数的输出单极和偏移输入产生0001-5999计数的输出
在全分辨率格式中，2.4%的超出范围值可以读取到指定的模块的准确性。可以用这种方式阅读。当超出范围时发生超出范围的情况时，MSB（位16）设置为1。如果低于范围发生第二个MSB（位15）也设置为1的情况。剩余的14位给出超出或低于范围的金额的绝对值。例如，对于单极输入如果输出电压为5.120伏，则将位16设置为1。其余输出位等于120毫伏的原始二进制表示。高于0.120的任何输入此范围内的电压将不在模块的指定精度范围内。
十进制输出格式允许按比例输出，以提供0001-9999个完整计数规模此格式并不表示模块的真实分辨率。对于双极型输入-输出按比例缩小，对于单极输入，输出按比例增大。这format还以与完整分辨率相同的方式报告超出范围的值
General Characteristics
The B875–111 Analog analog-to-digital (A/D) Input Module (B875) converts input voltage and/or input current ranges into binary data. This module can be configured to accept 8 differential or 16 single ended inputs. When selected for 8 differential inputs, the card is called a B875–111. When selected for 16 single ended inputs, the card is called a B877–111. Refer to the simplified schematic below. The B875 Analog Input module allows the polling of a wide array of field devices requiring different voltages and different currents based upon a unique application. One can select from five available input voltage ranges on a module-wide basis. The ranges, which are 0 to 5V, 1 to 5V, --5 to 5V, 0 to 10V, and -10 to 10V, are selected by means of four DIP switches on the module configuration switch. One can select from three available input current ranges, which are 0 to 20 mA, 4 to 20 mA, and -20 to +20 mA. One can select from four available output formats. The formats, which are standard, elevated, full resolution, and decimal, are selected by means of two DIP switches on the module configuration switch. One can select either no averaging, or 8, 16, or 32 sample inputs to be averaged to generate each output by means of two DIP switches on the module configuration switch. The module has eight/sixteen analog inputs and is capable of updates to all channels every 10—20 msecs. The greater than 12-bit resolution and the absolute accuracy of 0.1% at 0—60° C provides precise control of the application.
The B875-111 module
is shipped from the factory with the 1—5 V range with 0— 4095 output format (standard), one sample averaged, and voltage inputs, 8 channel (B875-111)–i.e., all DIP switches to the right. If necessary, reset the module configuration switch and the five-position DIP switch based upon the application requirements prior to installation. Refer to the illustration of the module configuration switch, below. Module Configuration Switch with DIP Switches The following illustration shows the module configuration switch and DIP switch settings for the B875–111 module. B875–111 Analog Input Module, Module Configuration Switch and DIP Switch Settings Standard output format is raw binary output, 0—4095 counts. Under range is 0000 and over range is 4096. Elevated output format is raw binary output, 4096—8191 counts. Under range is 4095 and over range is 8192. Full resolution output format provides the true resolution of the module which depends on the input range. Bipolar inputs produce an output of 0001—14,999 counts Unipolar inputs produce an output of 0001—7499 counts Unipolar and offset inputs produce an output of 0001—5999 counts In the full resolution format, out-of-range values of 2.4% may be read to the specified accuracy of the module.
They can be read in this manner.
When an out-of-range condition occurs which is over range the MSB (bit 16) is set to 1. If an under range occurs the second MSB (bit 15) is also set to 1. The remaining 14 bits give the absolute value of the amount over or under range. For example, for a unipolar input of 5.120 volts the output would have bit 16 set to 1. The remaining output bits equaling the raw binary representation of 120 millivolts. Any input above the 0.120 volts in this range willnot be within the specified accuracy of the module. Decimal output format allows scaled outputs to provide 0001—9999 counts full scale. This format does not indicate the true resolution of the module. For bipolar inputs the output is scaled down and for unipolar inputs the output is scaled up. This format also reports out-of-range values in the same manner as the full resolution mode.
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