Hi Anas,
The example VI you specified indicates it can only be used with PXI-6115. From what I understand, the PLL circuit is not available on PCI-6115. If you're trying to synchronize two PCI-6115 boards, take a look at the attached LabVIEW shipping example involving the RTSI bus. This program works with the PCI-6115 device as well.
Thanks,
Lesley Y.
National Instruments