Trigger damage

[xl600]

Multiple help files and web locations mention that damage may occur to a PXI trigger bus if multiple drivers attempt to drive a single trigger (EX: PXI_Trig0) line.  Some go farther to mention that this applies to third party devices in particular.

I have 2 PXIe-7966R boards, a pair of PXI-6281's, and a 6514 in a PXIe-1082 chassis.

• If DAQmx attempts to drive a trigger that an FPGA is attempting to drive, will it actually damage anything?
• If both FPGAs attempt to drive the same trigger, will that cause any damage?

I guess I'm asking this:  Are NI devices protected from multiple drivers by design?

I ask just in case my trigger selection logic doesn't work (During development).  The last thing I would want to see if a 7966R get damaged!

Thanks,

XL600

[M0535]

Hi xl600,

The software should throw an error of two devices try to trigger the same line at the same time. 

Yes, NI devices are protected by design because you it won't allow you to program cards that will interfere with each other.

[xl600]

Are you saying that the 7966R cannot drive the PXI_Trig lines without the host VI reserving the trigger first?  That wasn't very clear in the help files (They say reserving is optional).  If reserving is optional as the help files seem to indicate, that's where my concern lies.

Thanks

[M0535]

xl600,

I have been doing more research into this issue, and it seems that since the Flex RIO card does more hardware operations, there may actually be an event where the trigger line is used at the same time without an error shown or stopping the task.

I am doing some further checking to see if there is anything on the PXI backplane that would prevent something like this from occurring.

[xl600]

Thanks for checking into this.  FlexRIO does or can do so many non-standard things it's always a concern.

Xl600