triggerlist intermittency

[Jo-Jo]

I have seven Sorensen power supplies connected via GPIB to a PC with an NI GPIB card.  I need to be able to bring all of the power supplies up, or down, at the same time.  I wrote a VI in LabVIEW 7.1 using Triggerlist, but for some reason, every once in a while, about every four or five command cycles, one of the power supplies, not always the same one, will not execute its command to power up or down when I send the trigger via Tiggerlist.  I've been working with GPIB for a couple years, but I have not used the trigger functions before this, is there something I'm missing?

[Matt_S.]

Hi Jo-Jo,

Could you post an NI-Spy capture as well as a small screenshot of your code? Hopefully that will help us see what's going on with your system. One more thing that may come in handy is trying to watch this with a GPIB + card and use the GPIB bus analyzer. If you have another computer with a GPIB+ card, connect it to this bus and just monitor the bus using that card. Then we could see the line states on the bus.

Regards,
Matt S.