Configuring the Master Timebase Source for the NI 9225/9229/9239 (FPGA Interface)

CompactRIO

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Configuring the Master Timebase Source for the NI 9225/9229/9239 (FPGA Interface)

By default, the NI 9225/9229/9239 module uses the internal 12.8 MHz Onboard Clock as the master timebase source. In a system with multiple NI 9225/9229/923x modules, you can configure one of the NI 9225/9229/923x modules as the master timebase source (master) and configure the other NI 9225/9229/923x modules to use that master timebase source (slaves). Sharing the same master timebase source enables you to synchronize multiple NI 9225/9229/923x modules. The NI 9225/9229/9239 divides the master timebase source to acquire data at the data rate you configure.

Note Note  The cRIO-9151 R Series Expansion chassis does not support synchronizing multiple NI 9225/9229/923x modules.

Configuring the Onboard Clock as the Master Timebase Source

Complete the following steps to configure the internal 12.8 MHz Onboard Clock as the master timebase source.

  1. Configure the CompactRIO system, and add an NI 9225/9229/9239.
  2. Right-click the NI 9225/9229/9239 in the Project Explorer window and select Properties to display the C Series Module Properties dialog box.
  3. Select <Onboard Clock> from the Master Timebase Source pull-down menu.
  4. Click the OK button.
  5. Select File»Save All in the Project Explorer window.

Configuring a Master Module to Share the Master Timebase Source with Slaves

Complete the following steps to configure the master timebase source for a master module and slaves.

  1. Configure the CompactRIO system, and add an NI 9225/9229/9239.
  2. Right-click the NI 9225/9229/9239 in the Project Explorer window and select Properties to display the C Series Module Properties dialog box.
  3. Select <Onboard Clock> from the Master Timebase Source pull-down menu.
  4. Place a checkmark in the Export Onboard Clock checkbox.
  5. Right-click the NI 9225/9229/9239 you want to configure as a slave in the Project Explorer window and select Properties to display the C Series Module Properties dialog box.
  6. Select the name of the master module from the Master Timebase Source pull-down menu.
  7. Repeat steps 5 and 6 for each slave module you want to configure.
  8. Click the OK button.
  9. Select File»Save All in the Project Explorer window.
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