National Instruments NI-9421 Getting Started
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National Instruments NI-9421 Getting Started

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NI-9421 Getting
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2022-07-06

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  • Page 1 NI-9421 Getting Started 2022-07-06...

  • Page 2: Table Of Contents

    NI-9421 with DSUB Safety Voltages........

  • Page 3: Before You Begin

    NI-9421 Getting Started Before You Begin Read the NI-9421 Safety, Environmental, and Regulatory Information and complete the software and hardware installation procedures in your chassis documentation. Safety Guidelines Caution Observe all instructions and cautions in the user documentation. Using the product in a manner not specified can damage the product and compromise the built-in safety protection.
  • Page 4 Caution You must use the connector backshell kit to ensure that the terminals are not accessible. NI-9421 with Screw Terminal and NI-9421 with Spring Terminal Safety Voltages Connect only voltages that are within the following limits: Channel-to-COM...

  • Page 5: Ni-9421 With Dsub Safety Voltages

    1,000 V RMS, verified by a 5 s dielectric withstand test Safety Guidelines for Hazardous Locations The NI-9421 is suitable for use in hazardous locations; , and hazardous locations; and nonhazardous locations only. Follow these guidelines if you are installing the NI-9421 in a potentially explosive environment.
  • Page 6 Each NI-9421 is marked 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-9421 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.

  • Page 7: Electromagnetic Compatibility Guidelines

    Furthermore, any changes or modifications to the product not expressly approved by National Instruments could void your authority to operate it under your local regulatory rules. Special Conditions for Marine Applications Some products are approved for marine (shipboard) applications.

  • Page 8: Preparing The Environment

    NI-9421 with spring terminal. NI-9421 Signals Each channel of the NI-9421 has a DI terminal or pin to which you can connect voltage or current signals. The NI-9421 also has COM, a common terminal or pin that is internally connected to the isolated ground reference of the module.

  • Page 9: Connecting Sourcing-Output Devices

    DI. An example of a sourcing-output device is an open collector PNP. Connect the output of the sourcing-output device to DI on the NI-9421. Connect the common of the external device to the COM terminal or pin.

  • Page 10: Ni Services

    NI product. Product registration facilitates technical support and ensures that you receive important information updates from NI corporate headquarters is located at 11500 N Mopac Expwy, Austin, TX, 78759-3504, USA. ni.com © 2022 National Instruments Corporation.

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