topic Re: cRIO standalone application in LabVIEW

cRIO standalone application

nicola_rosso_96 — Thu, 02 Sep 2021 10:48:58 GMT

Hello,

I'm trying to develop a cRIO standalone application using the cRIO-9054: the target is to start the data logging procedure without the need to maintain the connection to a PC. Is there a way to control the C-Rio without any input from the LabView environment? How can the data-logging start with no LAN connection between the C-Rio and the PC?

Re: cRIO standalone application

crossrulz — Thu, 02 Sep 2021 12:14:58 GMT

You could use a digital input to trigger logging.

Re: cRIO standalone application

Bob_Schor — Sat, 04 Sep 2021 00:25:53 GMT

@nicola_rosso_96 wrote:

Hello,

I'm trying to develop a cRIO standalone application using the cRIO-9054: the target is to start the data logging procedure without the need to maintain the connection to a PC. Is there a way to control the C-Rio without any input from the LabView environment? How can the data-logging start with no LAN connection between the C-Rio and the PC?

The cRIO can "see" whatever is connected to it. In particular, it can "see" the data that it is recording, and (possibly) can "see" a clock. So if your criterion to start data-logging is data-based (i.e. "start recording when the voltage exceeds 3V" or "start recording when the S/N ratio is > 2.3"), the cRIO can "control itself". You can also, say, connect a push-button to a DIO line and say "Start acquisition when I push this button".

Bob Schor

Re: cRIO standalone application

Thomas444 — Fri, 10 Sep 2021 11:50:15 GMT

You can trigger DAQ in multiple ways:

After startup
Time elapsed since last DAQ
Digital trigger signal is rising/falling (through DI or AI modules)
Your measured signal has a specific characteristics (start DAQ only if signal RMS > limit)
Network communication

Luckily your 9054 RIO has PFI bus (the golden connector) which you can use (and connect it to FPGA too, but it is a little bit tricky) as a digital input. Having a button, you can come up with a simple circuitry which can be used for triggering DAQ.