I am having trouble with my PXI-2520 relay module. I am using it to control power to a few external devices (28V at 0.5A). From the spec this is within acceptable ranges. I have noticed that a number of relays appear to be stuck in the closed position (power is still getting to some devices). Using NI Switch soft front panel or running a C program (using NI DAQmx) will not open the relays. The C program is returning success and the test panel is showing the relays are open but they are not. I have tried restarting the PXI controller, resetting the module, performing the self test in MAX and nothing is working. This is a relatively new purchase, the relay count is very low (around 40). Are the relays already damaged? Is there any way to get these relays to respond?