Emerson Exchange 365

The PID algorithm is fundamentally the same for all vendors so there should not be much variation due to algorithm. However, one difference between control-in-the-field (CIF) and centralized control is that CIF is time-synchronized from sensor to actuator since fieldbus is time-synchronized end-to-end thanks to close loop digital control as there is no analog signal involved anymore. You can see the video here which is a software simulation of what you want to do:
www.youtube.com/watch
For pressure and flow, FF loops performs 10-15% better than a loop using 4-20 mA signals. Most beneficial at slow [1 second] controller cycle time. Significant if loops are run slow to decrease controller load. Enables more loops per controller.

We have done these tests in Emerson as well. I will send you material if I can find it.