Solution:

To work with PCI-1762 in Labview, except the 32-bit DLL driver, you must consider the relatvie high speed program of PCI-1762 is too fast for the relay board PCI-1762 to respond. If we can prolong the polling period and the PCI-1762 can work normally. After testing, we have found that the PCI-1762 can work with Labview driver if we make some modification to the example. We can do that by simply add time-delay into the while loop.