Bug? SigEx does not recognize signals after a hardware restart

[OKors]

I'm having issues with SigEx not seeing my signals after a hardware restart.

I can build a test, and acquire data all day long but as soon as I shut the SCXI chassis down and restart it all the channels flat-line. It's not even like its seeing erroneous signals, the signal is flat; like all the channels go open.

I've tried every combination of restarting the .seproj test file along with the SCXI chassis.

• shut both chassis and SigEx down, power on chassis, then open test = nothing
• open test, THEN power on chassis = nothing
• open test, power on chassis, RESET chassis (via the reset button) = nothing.

I should also mention, while in this 'no signal mode' I've checked and verified the excitation voltage is there.

The only way to get my signals back is to either delete the channel from the DaqMX Acquire step and rebuild it. Or; still a pain but much easier than rebuilding all the channels, assign the channels a new Custom Scale (doesn't matter which; pick one from the list), record a dummy file- now SigEx sees the signals again (albiet obviously scaled wrong), then go back and reassign the channels to the appropriate scale.

I can recreate this issue at will so it's not even like it's a one-off anomoly.

Anyone else have this problem?

If so I'd like to get a Corrective Action request going.

[Ali M]

 Hello Okors,

The reason you are observing this behavior after power cycling your SCXI chassis (while your PC/controlling system is still on) is because a discrepancy occurs between the state of the hardware settings, and the driver's settings. This discrepancy occurs especially when the module(s) have programmable settings that have been modified from their default settings; therefore, once these settings have been programmatically reconfigured, the DAQ driver continues to operate correctly. If the power has been cycled on your SCXI chassis, there are several methods of correcting your program's behavior, please refer to the following KnowledgeBase:

1. What Are the Results of Cycling the Power (Off then Back On) or a Power Failure on an SCXI Chassis During Operation?

http://digital.ni.com/public.nsf/allkb/BC090D39BEC9ECBA86256AB800031DEA?OpenDocument

Regards,

Ali M

Applications Engineer

National Instruments