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How does Real-Time Hardware Update Its System Clock?

Primary Software: LabVIEW Modules>>Real-Time Module
Primary Software Version: N/A
Primary Software Fixed Version: N/A
Secondary Software: N/A
Hardware: Compact FieldPoint

Problem:
How and when does my Real-Time hardware (cFP, cRIO, or PXI) update its system clock?

Solution:
RT Series PXI Controller

• The RTOS obtains the system date and time from the BIOS at boot. The system time can be edited by booting into the BIOS.

cRIO Controller

• The controller updates its system clock by synchronizing with the internal high-precision, real-time clock at startup.

[c]FieldPoint 20xx Series

• The controller's system clock can be set by specifying a Time Server in the Network Settings Tab of your [c]FieldPoint 20xx.  The time server updates the system time of the FieldPoint controller at boot. 
  
• If no Time Server is specified, the date and time can be set programmatically using the RT Set Date and Time.vi.

Note:
All of these controllers keep their current system using an internal crystal oscillator after it has been set. 

Related Links:
KnowledgeBase 2JEEFNKN: Incorrect Time Stamps in Real-Time Time Critical Code
KnowledgeBase 4CQFC9LX:  Using the Internal Real-Time Clock on cRIO-901x Controllers
Developer Zone Tutorial:  Getting/Setting the System Date/Time on CVS and PXI RT Targets
Developer Zone Tutorial:  Setting the Date and Time Programmatically on a FieldPoint [c]FP-20xx Network Module

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Report Date: 05/05/2008
Last Updated: 10/27/2008
Document ID: 4L4C9UDO

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