06-23-2022 01:54 PM
I have a cDAQ-9184. In the cDAQ device I have NI 9401, 8 port digital IO card, and a NI 9269 analog output card. In my application I want to set the 8 lines out of the 9401 (digital card) to high, and trigger an analog output operation on the 9269 on the digital lines.
Per this application note it looks like I want to use one of the 8 PFI lines for my start trigger: Setting Up a Digital Trigger in a CompactDAQ Chassis - NI
My question is, do I need to do anything to connect the Digital output lines to a PFI line? or will the internal PFI line reflect the state of the line?
06-27-2022 11:29 AM
Each line form the 9401 can act as a PFI line, PFI0 is DIO0, PFI1 is DIO1 ... PFI8 is DIO8.
But if you are using all 8 lines from the 9401 as outputs, you don't have a free line to use as a PFI input.
06-27-2022 02:32 PM
So I can use the lower nibble, DIO0-DIO3 as outputs and then loopback one of those to a line on the upper nibble to use as a trigger?
06-27-2022 03:54 PM
Yes, that can work.