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3BUR001455R1数字输出模块
模块可以接线以接受以下类型的包：电流输入类型；电压输入类型；RTD输入类型；线性热电偶输入类型；应变计/载荷单元格输入类型。下面讨论这些输入类型及其连接。参考下图显示了电流输入的典型现场电路连接。电流输入的典型现场电路连接，如图A所示，每个电流输入中必须安装精度为20Ω的可熔电阻器频道易熔电阻器随每个4-20 mA或0-20 mA输入包提供。B875-200可安装在下沉或源配置中。每个通道都是浮动的。如果你需要场地，你可以在场地的一边打平手接线至底盘接地或使用屏蔽线，屏蔽线与底盘接地相连。参考注意低带宽电流输入（AS-5B32）
选择要用于当前输入包的通道。选择电流输入通过将输入组件与组件旁边的熔断电阻器一起插入适当的渠道。电流输入参考典型的现场电路连接将现场侧接线连接到现场适当的插脚时，如上图所示连接器。注：所有输入包提供从总线到现场接线的1500 Vac/2500 Vdc隔离。由于任何浮动输入可能会暴露于高达15 kV的静电荷，直接或通过电阻范围为1kW-10MW。在端子1、2、39处使用底盘接地或40.如果与输入一起使用的信号源具有到机箱接地的直流信号路径，
现场接线的B875端不需要额外的路径。
注：通道独立设置。上述任何包装类型均可混杂在一起。低带宽和宽带电压输入注意接收电压输入的通道。电压输入由选插入相应通道的输入包。参考下图，并将现场侧接线连接至现场连接器上的适当引脚。
电压输入的典型现场电路连接图
注：电压宽带宽输入包对噪声更加敏感
在输入行上。建议将低带宽包用于通用输入电压使用。
注：建议使用所示的屏蔽类型。信号源的一侧可能使用双绞线时，应连接至底盘接地。
注：通道独立设置。电流、电压、RTD、线性的任何混合物热电偶或应变计/称重传感器可用作输入。注意指定接收RTD输入的通道。RTD输入由选择插入相应通道的输入包。请参阅下图和将现场侧接线连接到现场连接器上的适当引脚。
RTD输入的典型现场电路连接图
Low and Wide Bandwidths Voltage Inputs
The module may be wired to accept the following types of packs: current input type; voltage input type; RTD input type; linear thermocouple input type; strain gauge/load cell input type. These input types and their connections are discussed below. Refer to the diagram showing the typical field circuit connections for current inputs, below. Typical field circuit connections for current inputs, diagram A precision 20 Ω fusible resistor must be installed in each current input channel. The fusible resistor is supplied with each 4 - 20 mA or 0 - 20 mA input pack. The B875-200 may be installed in either the sinking or sourcing configuration.Each channel is floating. Should you need a ground, you may tie one side of field wiring to chassis ground or use shield wiring with shield tied to chassis ground. Refer to note Note the channels to receive the voltage inputs. Voltage inputs are selected by inserting the input pack for the appropriate channel. Refer to the following drawing, and connect field-side wiring to the proper pins on the field connector. Typical field circuit connections for voltage inputs, diagram NOTE: Voltage wide bandwidth input packs are significantly more sensitive to noise on input lines. Low bandwidth packs are recommended for general purpose input voltage usage. NOTE: The shield-type shown is recommended. One side of the signal source may be connected to chassis ground when using twisted pair wiring. NOTE: Channels are set independently. Any mixture of current, voltage, RTD, linear thermocouple, or strain gauge/load cell may be used as inputs.
Low Bandwidth Current Inputs (AS-5B32)
Select the channels to be used for current input packs. Current inputs are selected by inserting the input pack, together with a fusible resistor beside the pack, for the appropriate channel. Refer to the typical field circuit connections for current inputs diagram, above, while connecting the field-side wiring to the proper pins on the field connector. NOTE: All input packs provide 1500 Vac/2500 Vdc isolation from bus to field wiring. Since any floating inputs may be exposed to static charges as high as 15 kV, connect one of the signal input leads to chassis ground either directly or through a resistor in the range of 1kW—10MW. Use the chassis ground at terminals 1, 2, 39 or 40. If the signal source used with an input has a dc signal path to chassis ground, no additional path is required at the B875 end of the field wiring. NOTE: Channels are set independently. Any of the pack types identified above can be intermixed.
