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89NU03A-E驱动板
输入选择首先，找到模块左侧的四个检修孔。这些孔允许访问三个四位和一个五位DIP开关。
接下来，设置底部五位DIP开关的开关位置5（SW5模块左侧的检修孔，用于选择输入范围。此开关必须对应八位模块配置DIP的开关位置8（SW8转换SW5和SW8设置必须相同。
注：对于开关SW5，输入范围如下：z对于10 V（10 V或0-10 V），将SW5放置在左侧。
z对于5 V（所有其他），将SW5放置在右侧。有两种方法可以配置模块以接受当前输入。有8个差动电流/电压输入模块称为B875-111。有16个单端电流/电压输入模块称为B877-111。B875-111现场连接为八个差动电流输入配置B875-111时，请注意将接收这些输入的通道。通过放置正极电压输入和电流之间的磁场连接器上的跳线相应通道的输入端子。例如，如果通道2要接收电流输入，必须在端子#7（CH2）和端子#6之间跳线电流输入CH2），如下图所示。
下图显示了B875的简化示意图–111模块。B875–111模拟输入模块
电流输入数据示例图注：
DIP开关可访问性在差速模式和应保留在出厂安装的电压输入位置。
注：在以下情况下，可以同时存在电流和电压输入
条件：
z 1-5伏和4-20毫安
z 0-5 V和0-20 mA
z 5和20 mA将现场侧接线连接至现场连接器上的适当引脚。电压输入不需要现场连接器上的跳线。请参阅显示典型现场电路连接，见下文。注意：开路电压输入可能正或负漂移。如果需要开路检测，应使用电流输入。使用电压时输入，如果大值电阻器（2 MΩ或更大）放置在正极（+）和负极（-）输入之间的现场连接器上。这个如果磁场连接断开。电流输入通过设置可通过侧面访问的DIP开关进行选择用于接收输入的每个通道的盖子。DIP开关的精度为250Ω正极输入和模拟回路之间的电阻。
位于左侧的开关组4上的第五个开关（SW5）选择电压范围此开关的位置必须与模块配置的位置相同开关SW8，位于模块后部。请参阅左侧的标签模块侧面，以及下面显示单端输入（B877）的当前设置的图示。单端输入的电流设置，图（B877）
Input Selection
First, locate the four access holes on the left side of the module. These holes allow access to three four-position and one five-position DIP switch. Next, set switch position 5 (SW5) of the five-position DIP switch found in the bottom access hole on the left side of the module, to select the input range. This switch must correspond to switch position 8 (SW8) of the eight-position module configuration DIP switch. SW5 and SW8 settings must be identical. NOTE: For switch SW5, the input ranges are as follows: z For 10 V (10 V or 0—10 V) place SW5 to the left. z For 5 V (all others) place SW5 to the right.There are two ways to configure the module to accept current inputs. With eight differential current/voltage inputs the module is called the B875-111. With sixteen single-ended current/voltage inputs the module is called the B877-111.
Connect field-side wiring to proper pins on the field connector. Voltage inputs do not require a jumper on the field connector. Refer to the illustration showing the typical field circuit connections, below. NOTE: Open-circuit voltage inputs may drift either positive or negatively. If opencircuit detection is required, a current input should be used. When using voltage inputs, an open circuit can be detected if a large-value resistor (2 MΩ or greater) is placed at the field connector across the positive (+) and negative (-) inputs. The resistor clamps the channel to a small offset voltage (<100 mV) if the field connections are broken.
B875-111 field connections
When configuring the B875-111 for eight differential current inputs, note the channels that will receive these inputs. Current inputs are selected by placing a jumper on the field connector between the positive voltage input and the current input terminal for the appropriate channel. For example, if channel 2 is to receive a current input, a jumper must be made between terminal #7 (CH2) and terminal #6 current input CH2), as shown on the following illustration. The following illustration represents the simplified schematic diagram for the B875– 111 module. B875–111 analog input module, current input dxample drawing NOTE: DIP switch accessibility DIP switches accessible through the side cover are not used in differential mode and should be left in the factory-installed voltage input positions. NOTE: Simultaneous current and voltage inputs can exist under the following conditions: z 1—5 V and 4—20 mA z 0—5 V and 0—20 mA z 5 and 20 mA
