產(chǎn)品內(nèi)容介紹
1756-RM/A直流電源模塊
特征B875–111模擬模數(shù)（A/D）輸入模塊（B875）轉(zhuǎn)換輸入電壓和/或輸入電流范圍轉(zhuǎn)換為二進(jìn)制數(shù)據(jù)。此模塊可以配置接受8個(gè)差分或16個(gè)單端輸入。當(dāng)為8個(gè)差速器選擇時(shí)輸入，該卡稱為B875–111。當(dāng)為16個(gè)單端輸入選擇時(shí)該卡名為B877–111。請(qǐng)參閱下面的簡(jiǎn)化示意圖。
B875模擬輸入模塊允許廣泛的現(xiàn)場(chǎng)設(shè)備輪詢根據(jù)不同的應(yīng)用需要不同的電壓和電流。
可以在模塊范圍內(nèi)從五個(gè)可用輸入電壓范圍中進(jìn)行選擇。這個(gè)范圍為0至5V、1至5V，-5至5V和0至10V，-10至10V通過(guò)模塊配置開(kāi)關(guān)上的四個(gè)DIP開(kāi)關(guān)。
可以從三個(gè)可用的輸入電流范圍中進(jìn)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(jìn)行選擇。
格式是標(biāo)準(zhǔn)的，通過(guò)打開(kāi)兩個(gè)DIP開(kāi)關(guān)選擇提升、全分辨率和十進(jìn)制模塊配置開(kāi)關(guān)。
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(gè)樣本輸入通過(guò)模塊上的兩個(gè)DIP開(kāi)關(guān)生成每個(gè)輸出配置開(kāi)關(guān)。
該模塊有8/16個(gè)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(duì)0-60°C時(shí)的精度為0.1%，可精確控制應(yīng)用。B875-111模塊出廠時(shí)電壓范圍為1-5 V，0-4095輸出格式（標(biāo)準(zhǔn)），一個(gè)平均采樣，電壓輸入，8通道（B875-111）–即所有DIP開(kāi)關(guān)都向右。如有必要，重置模塊配置開(kāi)關(guān)和基于應(yīng)用的五位DIP開(kāi)關(guān)安裝前的要求。
請(qǐng)參閱下面的模塊配置開(kāi)關(guān)圖示。
單元配置帶DIP的開(kāi)關(guān)
下圖顯示了模塊配置開(kāi)關(guān)和DIP開(kāi)關(guān)B875–111模塊的設(shè)置。
B875–111模擬輸入模塊、模塊配置開(kāi)關(guān)和DIP開(kāi)關(guān)
設(shè)置標(biāo)準(zhǔn)輸出格式為原始二進(jìn)制輸出，0-4095計(jì)數(shù)。低于范圍為0000超范圍為4096。
提升輸出格式為原始二進(jìn)制輸出，計(jì)數(shù)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(shí)分辨率取決于輸入范圍。
雙極輸入產(chǎn)生0001-14999計(jì)數(shù)的輸出
單極輸入產(chǎn)生0001-7499計(jì)數(shù)的輸出單極和偏移輸入產(chǎn)生0001-5999計(jì)數(shù)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(zhǔn)確性?？梢杂眠@種方式閱讀。當(dāng)超出范圍時(shí)發(fā)生超出范圍的情況時(shí)，MSB（位16）設(shè)置為1。如果低于范圍發(fā)生第二個(gè)MSB（位15）也設(shè)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(duì)值。例如，對(duì)于單極輸入如果輸出電壓為5.120伏，則將位16設(shè)置為1。其余輸出位等于120毫伏的原始二進(jìn)制表示。高于0.120的任何輸入此范圍內(nèi)的電壓將不在模塊的指定精度范圍內(nèi)。
十進(jìn)制輸出格式允許按比例輸出，以提供0001-9999個(gè)完整計(jì)數(shù)規(guī)模此格式并不表示模塊的真實(shí)分辨率。對(duì)于雙極型輸入-輸出按比例縮小，對(duì)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(bào)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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