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6018BZ10200C主控制卡
模塊安裝包括以下內(nèi)容：打開模塊包裝；設(shè)置配置交換機；在殼體中安裝鍵銷；在中安裝模塊住房連接連接器。按如下方式配置交換機組A：z A-1至A-6適用于預(yù)期輸入電壓范圍八路或四路配置
z A7選擇八路或四路輸入模式。
z正常操作時，A8至ON。如果正在使用電流檢測輸入電路，則跨接適當?shù)碾娏鳈z測現(xiàn)場連接器上的端子連接至相應(yīng)的熱輸入（+），如現(xiàn)場所示下面的連接器/輸入電路引腳分配圖。
注：應(yīng)終止未使用的輸入，以降低電氣噪聲和由于浮動輸入線引起的其他干擾。跳線未使用電壓和電流端子（包括屏蔽）至外殼接地。外殼接地僅為如果H8XX外殼接地，則有效。護罩的兩端不能連接到設(shè)備和模塊，除非設(shè)備屏蔽是一部分裝置輸入電路，且未在內(nèi)部連接至裝置外殼地
注：如果需要超范圍和欠范圍檢測導(dǎo)致未使用通道的吞吐量問題（因為它們是浮動的或峰值超出范圍），則現(xiàn)場連接器應(yīng)并聯(lián)至有效的輸入通道。只要由于有效通道保持在有效范圍內(nèi)，綁定通道也將保持在范圍
注：對于4-20 mA范圍內(nèi)的電流，僅有效輸入需要包括250Ω電阻器。一般特征B875–111模數(shù)（A/D）輸入模塊（B875）轉(zhuǎn)換輸入電壓和/或?qū)㈦娏鞣秶斎攵M制數(shù)據(jù)。此模塊可以配置為接受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(xiàn)場設(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)從五個可用輸入電壓范圍中進行選擇。這個范圍為0至5 V、1至5 V，--5至5 V和0至10 V，以及-10至10 V通過模塊配置開關(guān)上的四個DIP開關(guān)選擇。
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(guān)選擇提升、全分辨率和十進制模塊配置開關(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個樣本輸入通過模塊配置上的兩個DIP開關(guān)生成每個輸出轉(zhuǎn)換該模塊有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(yīng)用。
Field Connector/Input Circuit Pinout Diagram
If current sense input circuit(s) is being used, jumper appropriate current sense terminal on field connector to corresponding hot input (+) as shown in field connector/input circuit pinout diagram, below. NOTE: Unused inputs should be terminated to reduce electrical noise and other interference due to floating input lines. Jumper unused voltage and current terminals (including shields) to case ground. Case ground will only be effective if H8XX housing is connected to earth ground. Both ends of the shield cannot be connected to the device and module, unless the device shield is part of the device input circuit, and is not connected internally to the device case ground. NOTE: If over-range and under-range detection is required, and this detection is causing throughput problems with the unused channels (because they float or spike outside the range) then the unused voltage or current channels at the field connector should be connected in parallel to a valid input channel. As long as the valid channel stays within range, the tied channels will also stay within range. NOTE: For currents within the range of 4—20 mA, only the valid input requires the inclusion of the 250 Ω resistor.
General Characteristics
The B875–111 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 5 V, 1 to 5 V, --5 to 5 V, 0 to 10 V, and -10 to 10 V, 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.
