08-04-2011 10:38 AM
I had intended to use the USB-6008 in a critical application in which the Digital I/O lines are used to trigger relays. The relays must activate when I programmatically ask them to. Otherwise, they must absolutely stay open. The problem is that during a reboot of the OS, the USB-6008 Digital I/O go high and low several times - opening and closing my relays. This is not acceptable for my application.
Is there any way to prevent the lines from reaching logic high unless commanded to do so?!
Solved! Go to Solution.
08-04-2011 01:38 PM
There's no way to set the power-up states on the 6008.
As the USB system initializes the devices and the computer's power supply turns on and off power to the USB ports, the lines on the DIO are going to go up and down a few times.
You'll need to put some additional hardware logic just after the DAQ to ensure potentially dangerous output combinations can't affect the relays and items they control.