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89NU03E控制驱动板
应用程序示例
安装程序
配置开关组
B875–111可以配置为接受8个差分或16个单端输入。当为8个差分输入选择时，该卡称为B875–111。当为16个单端输入选择，该卡称为B877–111。此选择由后部配置开关组上的开关7进行模块的。SW7在左侧位置等于16个输入，在右侧位置等于等于8个输入。
除了选择输入数量外，您还可以选择电压范围、输出样本的格式、极性、偏移量和数量。请参阅安装说明以及模块左侧的DIP开关图，以了解详细信息。
对于快速启动设置，使用以下设置连接0至+10 V输入
信号对于以下输入参数：
z 0-10 V输入
z 0到满刻度输出格式
z一个样品
z八个差分输入
按如下方式设置开关设置：
z SW1、SW3、SW5、SW7=右
z SW2、SW4、SW6、SW8=左输入类型选择（电压或电流）
如果配置为B875（8个差动输入），则选择电流输入（4-20 mA通过在正极电压输入和适当通道的电流输入端子。请参阅下图。现场连接器跳线图当模块处于配置为16个单端输入。
注：开路电压输入可能正或负漂移。如果需要进行开路检测，应使用电流输入。使用时电压输入，如果电阻值较大（2 MΩ或更大）放置在正极（+）和负极之间的磁场连接器上（-）输入。电阻器将通道夹紧到一个小偏移电压（<100 mV）如果现场连接断开。快速启动测试将B875-111八通道差分模块配置为如下：0-10V输入范围；0-4096计数输出格式；无样本平均。
使用下表执行快速起动测试。如果配置为B877（16个单端电流输入），则通过以下方式选择输入类型模块左侧的开关。16个开关各有一个输入。该开关在正输入和模拟回路。不使用外部跳线，必须拆除。左侧位置等于电压输入，右侧位置等于电流输入。开关组4（左侧）上的第五个开关选择两个B875的电压范围和B877操作。此开关必须与配置的开关8相对应开关组（模块后部）。SW5的左侧位置等于10伏右侧位置等于5伏。SW8必须与SW5处于相同位置。对于0-10 V输入信号示例，将所有输入开关设置为左侧（向下或朝向数字）
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)
