Sadiah,
If you have already developed code using the SoftMotion software that I described previously, then the transition to a PAC may or may not require modification of your code. This is dependent upon what type of PAC you move to. If you developed your code on a PC with an M-series DAQ board and you move the code to a PXI chassis with an M-series DAQ device, then the code will not need to be modified. However, if you move the code to a cRIO or FieldPoint platform, then the code will require modification. There are several shipping examples that come with SoftMotion that demonstrate how to use each of these platforms. I would suggest starting with those examples and building your code from there.
For additional information on PACs and the benefits of their use, take a look at the following documentation:
PACs for Industrial Control, the Future of Control
http://zone.ni.com/devzone/conceptd.nsf/webmain/63b424952e7eb98b86256f9b00766805
A Comparison of PACs to PLCs
http://zone.ni.com/devzone/conceptd.nsf/webmain/bb14727c48c013ef86256f81007fb095
Please let me know if you have any additional questions on this issue.
Regards,
Scott R.
Applications Engineer
National Instruments
Scott Romine
Course Development Engineer
National Instruments