01-29-2015 04:04 PM
Hi,
I am programming for a cRIO 9076 with NI 9221, 9402 and 9211 modules. The most challenging part is how to setup a time to activate one digital output channel of NI 9402 deterministically. I need use NI 9221 to measure a 60 Hz since wave, upon detecting a zero crossing, add user specified microseconds, then trigger the digital output. I understand I may use FPGA zero crossing VI to get my time to start. The problem is LABVIEW only has millisecond loop timer while I need setup trigger time with microsecond resolution.
On LabVIEW Real Time 1 Exercises' Course Slides page A44, it showed Real-time timing express VIs that can do microsecond timing tasks. However, I cannot find them in my computer. Can anybody point out where they are? Thanks a lot in advance.
NI Software : LabVIEW Base Development System
version 2013 SP1 , RT and FPGA modules
NI Hardware : CompactRIO device CRIO-9076
01-29-2015 04:14 PM
Sorry I just found that Loop Timer Express VI that actually allow me to select the counter unit as us.
Never mind the question.
Have a good day.