How to get system time from cRIO?

[SPlatten]

Hello,

I have an NI cRIO-9076 chassis with an NI-9467 GPS module and an NI-9234 module.

I've downloaded the FPGA Timekeeper application which synchronises the FPGA clock to the 1PPS GPS, this works well.  What I want to do is create a trigger that at a pre-defined HH:MM:SS the system will start to acquire and log data from the Accelerometers connected to the NI-9234 module.

I have added the controls for the entry of the HH:MM:SS and calculated the time in seconds.  I would like to compare the system clock once it is locked to the entered timestamp and then trigger.

As I only have a value that represents seconds in the day I need to calculate the offset from EPOCH to compare against the GPS time reference.  I have read that the NI system clock runs from 01/01/1904 instead of the EPOCH 01/01/1970.

The question is how do I get the current system time so that I can compare it against the entered time?  I only need seconds in the day = (HH * 3600) + (MM * 60) + (SS)

Thank you,

Kind Regards,

Simon

[Craig_]

Have you tried using the "Get Date/Time in Seconds" VI?

http://zone.ni.com/reference/en-XX/help/371361K-01/glang/get_date_time_in_seconds/

It works the same on RT targets as it does in Windows.

[BFeigum]

You should use the Get Date/Time in Seconds VI which will return a timestamp. You can then format this timestamp using the Format Date/Time String to give you exactly the time format that you need. Then you can extract the numbers you need and do your math.

[SPlatten]

Thank you, I've tried using the code but I'm getting errors:

Target Specific Errors and Warnings:

  Decimal String To Number: Function not supported for current target

  Match Pattern: Functiron not supported for current target

  Diagram Constant: Type not supported in current target

  Wire: Type not supported in current target

  Get Date//Time in Seconds: Function not supported for current target

  Front Panel Terminal 'date/time string': Type not supported in current target

These errors only occur once I paste the logic from the "Get Seconds in Day.vi" into the project.

[SPlatten]

Just to recap, we have a cRIO-9076, with a NI-9467 and a NI-9234.  I've been talking to NI support and I am told that the string handling functions and time conversion functions are not supported by the FPGA target, which would explain the error messages.  Is it possible to do what I want with the hardware we have?

What we are trying to do is synchronise the chassis using the GPS 1PPS clock, then trigger an activity based on a user configurable time.

[BFeigum]

You did not mention that you were trying to accomplish this on the FPGA target. The solution I posted will work on the RT target. 

[SPlatten]

The first line of my original post specifies the hardware, sorry if I missed something, I thought I had been specific.

I'm very new to cRIO and still finding my way. 

[SPlatten]

Solved !

Have created a VI on the Chassis, I have accessed the FPGA global variables "FPGA Timekeeper time(ns)" and "FPGA Timerkeeper locked".