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89NU03E控制驅(qū)動板
應(yīng)用程序示例
安裝程序
配置開關(guān)組
B875–111可以配置為接受8個差分或16個單端輸入。當(dāng)為8個差分輸入選擇時，該卡稱為B875–111。當(dāng)為16個單端輸入選擇，該卡稱為B877–111。此選擇由后部配置開關(guān)組上的開關(guān)7進(jìn)行模塊的。SW7在左側(cè)位置等于16個輸入，在右側(cè)位置等于等于8個輸入。
除了選擇輸入數(shù)量外，您還可以選擇電壓范圍、輸出樣本的格式、極性、偏移量和數(shù)量。請參閱安裝說明以及模塊左側(cè)的DIP開關(guān)圖，以了解詳細(xì)信息。
對于快速啟動設(shè)置，使用以下設(shè)置連接0至+10 V輸入
信號對于以下輸入?yún)?shù)：
z 0-10 V輸入
z 0到滿刻度輸出格式
z一個樣品
z八個差分輸入
按如下方式設(shè)置開關(guān)設(shè)置：
z SW1、SW3、SW5、SW7=右
z SW2、SW4、SW6、SW8=左輸入類型選擇（電壓或電流）
如果配置為B875（8個差動輸入），則選擇電流輸入（4-20 mA通過在正極電壓輸入和適當(dāng)通道的電流輸入端子。請參閱下圖?，F(xiàn)場連接器跳線圖當(dāng)模塊處于配置為16個單端輸入。
注：開路電壓輸入可能正或負(fù)漂移。如果需要進(jìn)行開路檢測，應(yīng)使用電流輸入。使用時電壓輸入，如果電阻值較大（2 MΩ或更大）放置在正極（+）和負(fù)極之間的磁場連接器上（-）輸入。電阻器將通道夾緊到一個小偏移電壓（<100 mV）如果現(xiàn)場連接斷開?？焖賳訙y試將B875-111八通道差分模塊配置為如下：0-10V輸入范圍；0-4096計數(shù)輸出格式；無樣本平均。
使用下表執(zhí)行快速起動測試。如果配置為B877（16個單端電流輸入），則通過以下方式選擇輸入類型模塊左側(cè)的開關(guān)。16個開關(guān)各有一個輸入。該開關(guān)在正輸入和模擬回路。不使用外部跳線，必須拆除。左側(cè)位置等于電壓輸入，右側(cè)位置等于電流輸入。開關(guān)組4（左側(cè)）上的第五個開關(guān)選擇兩個B875的電壓范圍和B877操作。此開關(guān)必須與配置的開關(guān)8相對應(yīng)開關(guān)組（模塊后部）。SW5的左側(cè)位置等于10伏右側(cè)位置等于5伏。SW8必須與SW5處于相同位置。對于0-10 V輸入信號示例，將所有輸入開關(guān)設(shè)置為左側(cè)（向下或朝向數(shù)字）
Application Example
Setup Configuration switch pack The B875–111 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. This selection is made by switch 7 on the configuration switch pack found at the rear of the module. SW7 in the left position is equal to 16 inputs, in the right position it is equal to 8 inputs. In addition to selecting the number of inputs, you also select voltage range, output format, polarity, offset and number of samples. Refer to the installation instructions and the DIP-switch chart on the left side of the module for details. For a quick start setup, use the following settings to interface a 0 to +10 V input signal. For the following input parameters: z 0—10 V input z 0 to full scale output format z One sample z Eight differential inputs Set the switch settings as follows: z SW1, SW3, SW5, SW7=right z SW2, SW4, SW6, SW8=left Input type selection (voltage or current) If configured as a B875 (8 differential inputs), current inputs (4—20 mA) are selected by placing a jumper at the field connector between the positive voltage input and the current input terminal for the appropriate channel. Refer to the following illustration. Field connector jumper diagram The quick-start test configures a B875-111 eight-channel differential module as follows: 0—10 V input range; 0—4096 counts output format; no sample averaging. Use the following table to perform the quick-start test.
If configured as a B877
(16 single ended current inputs), input type is selected by the switches on the left side of the module. There is one switch for each of the 16 inputs. This switch places a 250 Ω precision resistor between the plus input and analog return. External jumpers are not used and must be removed. The left position is equal to voltage input, and the right position is equal to current input. The fifth switch on switch bank 4 (left side) selects the voltage range for both B875 and B877 operations. This switch must correspond to switch 8 of the configuration switch bank (at rear of module). The left position of SW5 is equal to 10 volts, and the right position is equal to 5 volts. SW8 must be in the same position as SW5. For the 0—10 V input signal example, set all the input switches to the left (down or towards the numbers)
