產品內容介紹
1756-RM/A直流電源模塊
特征B875–111模擬模數（A/D）輸入模塊（B875）轉換輸入電壓和/或輸入電流范圍轉換為二進制數據。此模塊可以配置接受8個差分或16個單端輸入。當為8個差速器選擇時輸入，該卡稱為B875–111。當為16個單端輸入選擇時該卡名為B877–111。請參閱下面的簡化示意圖。
B875模擬輸入模塊允許廣泛的現場設備輪詢根據不同的應用需要不同的電壓和電流。
可以在模塊范圍內從五個可用輸入電壓范圍中進行選擇。這個范圍為0至5V、1至5V，-5至5V和0至10V，-10至10V通過模塊配置開關上的四個DIP開關。
可以從三個可用的輸入電流范圍中進行選擇，即0至20 mA、4至20 mA和-20至+20 mA。
可以從四種可用的輸出格式中進行選擇。
格式是標準的，通過打開兩個DIP開關選擇提升、全分辨率和十進制模塊配置開關。
可以選擇不求平均值，也可以選擇要求平均值的8、16或32個樣本輸入通過模塊上的兩個DIP開關生成每個輸出配置開關。
該模塊有8/16個模擬輸入，能夠更新所有地震道每10-20毫秒。大于12位的分辨率和絕對0-60°C時的精度為0.1%，可精確控制應用。B875-111模塊出廠時電壓范圍為1-5 V，0-4095輸出格式（標準），一個平均采樣，電壓輸入，8通道（B875-111）–即所有DIP開關都向右。如有必要，重置模塊配置開關和基于應用的五位DIP開關安裝前的要求。
請參閱下面的模塊配置開關圖示。
單元配置帶DIP的開關
下圖顯示了模塊配置開關和DIP開關B875–111模塊的設置。
B875–111模擬輸入模塊、模塊配置開關和DIP開關
設置標準輸出格式為原始二進制輸出，0-4095計數。低于范圍為0000超范圍為4096。
提升輸出格式為原始二進制輸出，計數為4096-8191。低于范圍為4095及以上范圍為8192。
全分辨率輸出格式提供了模塊的真實分辨率取決于輸入范圍。
雙極輸入產生0001-14999計數的輸出
單極輸入產生0001-7499計數的輸出單極和偏移輸入產生0001-5999計數的輸出
在全分辨率格式中，2.4%的超出范圍值可以讀取到指定的模塊的準確性。可以用這種方式閱讀。當超出范圍時發生超出范圍的情況時，MSB（位16）設置為1。如果低于范圍發生第二個MSB（位15）也設置為1的情況。剩余的14位給出超出或低于范圍的金額的絕對值。例如，對于單極輸入如果輸出電壓為5.120伏，則將位16設置為1。其余輸出位等于120毫伏的原始二進制表示。高于0.120的任何輸入此范圍內的電壓將不在模塊的指定精度范圍內。
十進制輸出格式允許按比例輸出，以提供0001-9999個完整計數規模此格式并不表示模塊的真實分辨率。對于雙極型輸入-輸出按比例縮小，對于單極輸入，輸出按比例增大。這format還以與完整分辨率相同的方式報告超出范圍的值
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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