CompactDAQ digital latch input

[d_vinson]

I've used LV for several years but I'm new to CompactDAQ. I have a digital input (looking at contact closure on protection relay) that may switch on, then off, so quickly I miss it while reading inputs. Does LV or CompactDAQ have a way of latching input (think PLC's have this capability) so I don't miss it? Thanks

[Kyle97330]

You could look into using digital change detection:

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000PAn9SAG&l=en-US

You would need one of the CDAQ modules that supports it:

• NI 9401
• NI 9402
• NI 9411
• NI 9421
• NI 9422
• NI 9423
• NI 9435

In addition to what's shown on the page there, note that you can register for a change detection event as well:

[d_vinson]

That worked. Thanks for your help!