Change the output state if the connection is lost

Hello

I use a multifunction USB data acquisition system - 6341 XSeries to control an experience involving a heated hose.  I use MATLAB to read a number of analog sensors, and output digital to activate the relay to control certain devices of heating and a pressure relief valve.  My problem is if I lose power, someone throws a cable or my computer crashes Mid-test, I want the relay to turn off (IE, return all the digital outputs 0), for reasons of security.

I figured out how to make the default value to the output power up to 0, but I did not find anything describing how to do the same thing if a connection with the computer is lost.  Is there a property inside the acquisition of data that I can program to do something like that?

Thank you

Jimmy

The 6341 timer has a built-in digital i/o which is mentioned in the X series user manual in Chapter 6 (pdf link).

You reset the watchdog timer of your software loop - if the timer expires the material past to a predefined State.

I have no idea how it is configured in MATLAB, but in the C API functions used are DAQmxCreateWatchdogTimerTask to create the task and DAQmxControlWatchdogTask to reset the timer.

Best regards

Tags: NI Hardware

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