What specific devices? On many common DAQ devices, analog outputs will hold their last voltage level after you stop (and even clear) the task. I don't think digital outputs do the same, at least some common ones I've worked with definitely don't (M-series, X-series).
But you'd also need to determine from your specs whether the AO channel can source enough current to drive the relay coil.
-Kevin P
CAUTION! New LabVIEW adopters -- it's too late for me, but you *can* save yourself. The new subscription policy for LabVIEW puts NI's hand in your wallet for the rest of your working life. Are you sure you're *that* dedicated to LabVIEW? (Summary of my reasons in this post, part of a voluminous thread of mostly complaints starting here).
