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Related Manuals for Farnell NI-9881
Summary of Contents for Farnell NI-9881
- Page 1 NI-9881 Getting Started 2022-07-06...
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Page 2: Table Of Contents
Connecting a CAN Bus to the NI-9881........ -
Page 3: Before You Begin
Safety Guidelines for Hazardous Locations The NI-9881 is suitable for use in Class I, Division 2, Groups A, B, C, D, T4 hazardous locations; Class I, Zone 2, AEx nA IIC T4 Gc and Ex nA IIC T4 Gc hazardous locations;... - Page 4 II 3G and is suitable for use in Zone 2 hazardous locations, in ambient temperatures of -40 °C ≤ Ta ≤ 70 °C. If you are using the NI-9881 in Gas Group IIC hazardous locations, you must use the device in an NI chassis that has been evaluated as Ex nC IIC T4, Ex IIC T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.
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Page 5: Wiring The Ni-9881
Wiring the NI-9881 The NI-9881 has one 9-pin male D-Sub connector that provides connections to a CAN bus. The NI-9881 has pins for CAN_H and CAN_L, to which you connect the CAN bus signals. Connect these signals using twisted-pair cable. -
Page 6: Can Bus Topology And Termination
Figure 2. CAN Bus Topology and Termination Resistor Locations Connecting a CAN Bus to the NI-9881 You can connect the NI-9881 port to any location on a CAN bus. The following figure shows one example of connecting the NI-9881 directly to one CAN node. -
Page 7: Cabling Requirements For The Ni 9881
NI-9881 Getting Started Figure 3. Connecting the NI-9881 to a CAN Device Cable Specifications Cables should meet the physical medium requirements specified in ISO 11898, shown in the following table. Belden cable (3084A) meets all these requirements and should be suitable for most applications. -
Page 8: Cable Lengths
The NI-9881 electrical characteristics allow at least 110 CAN ports on a network. NI-9881 Hardware Overview The NI-9881 has one full-featured CAN port that is isolated from the other modules in the system. The port has a Bosch DCAN CAN controller that is CAN 2.0B- compatible and fully supports both 11-bit and 29-bit identifiers. -
Page 9: Power Requirements
NI-9881 Getting Started High-Speed CAN Characteristics Transceiver NXP PCA82C251T Max baud rate 1 Mbps CAN_H, CAN_L bus lines voltage -27 to +40 VDC CAN Supply voltage range (V ) +9 to +30 VDC MTBF Contact NI for Bellcore MTBF or MIL-HDBK-217F specifications. -
Page 10: Shock And Vibration
NI-9881 Getting Started External power supply (Vsup) +9 V DC to +30 V DC Isolation Port-to-earth ground Continuous 60 V DC, Measurement Category I Withstand 500 V RMS, verified by a 5 s dielectric withstand test The maximum voltage that can be applied or output between any port or V terminal and a COM terminal without creating a safety hazard. -
Page 11: Ni Services
NI-9881 Getting Started Indoor use only. NI Services Visit ni.com/support to find support resources including documentation, downloads, and troubleshooting and application development self-help such as tutorials and examples. Visit ni.com/services to learn about NI service offerings such as calibration options, repair, and replacement.