Change Output State if Connection is Lost

Hello,

I am using a USB-6341 XSeries multifunction DAQ system to control an experiment involving a heated pipe.  I am using MATLAB to read a number of analog sensors, and the Digital Outputs to activate relays to control some heaters and a pressure relief valve.  My problem is that if I lose power, someone kicks a cable, or my computer crashes mid-test, I want the relays to turn off (ie return all the digital outputs to 0), for safety reasons.

I have figured out how to have the default output on power up be 0, but I havent come across anything describing how to do the same thing if a connection with the computer is lost.  Is there a property inside the DAQ that I can program to do something like this?

Thanks

Jimmy