Installing the Module Immobilization Accessory

The Module Immobilization accessory ensures that the C Series module latches cannot be retracted and modules cannot be removed from a system. The Module Immobilization accessory provides extra system assurance and security when shipping and installing systems, and prevents accidental removal from a system during operation.

When using the Module Immobilization accessory, NI recommends installing the accessory prior to mounting the system in any enclosure because the accessory requires tool access to the top, right, and bottom of the cRIO-903x.

What to Use

  • cRIO-903x
  • C Series modules
  • Module Immobilization accessory kit, containing the module immobilization bracket, an M4 x 0.7 button-head 8 mm installation screw, and M3 x 0.5 flat-head 10 mm installation screws (x2):[1]1 The Module Immobilization accessory kit includes two sets of screws. One set is a standard set of screws that require a standard driver type, Torx T10 and T20. The other set is a tamper-resistant set of screws that require a security driver type, Torx T10H and T20H. Use the tamper-resistant set to help prevent unintended modification of the system.
    • (cRIO-9030/9031/9032/9033/9034) Part number 158534-01
    • (cRIO-9035/9036/9037/9038/9039) Part number 158533-01
  • Torx T10/T10H driver
  • Torx T20/T20H driver

What to Do

Complete the following steps to install the Module Immobilization accessory.


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  1. Ensure that all the C Series modules are installed in the cRIO-903x and the latches are locked in place.
  2. Remove the center right panel screw from the top and bottom of the cRIO-903x using the Torx T10 driver.
  3. Slide the bracket into place, aligning the three clearance screw holes.
  4. Install the M4 x 0.7 button-head screw in the right end of the cRIO-903x using the appropriate Torx T20 driver. Tighten the screw to a maximum torque of 1.3 N · m (11.5 lb · in.).
  5. Install the two M3 x 0.5 flat-head screws from the accessory kit in the top and bottom of the cRIO-903x using the appropriate Torx T10 driver. Tighten the screws to a maximum torque of 1.3 N · m (11.5 lb · in.).
    Tip NI recommends using a liquid thread locker for all fasteners if the system is expected to experience vibration for an extended amount or time.

1 The Module Immobilization accessory kit includes two sets of screws. One set is a standard set of screws that require a standard driver type, Torx T10 and T20. The other set is a tamper-resistant set of screws that require a security driver type, Torx T10H and T20H. Use the tamper-resistant set to help prevent unintended modification of the system.