I was able to quickly use the 9505 Servo Drive example to do closed loop position control on the FPGA but I'm having trouble with figuring out how to modify the code to support velocity control (which I need for a different axis). I'm trying to make my modifications on the FPGA VI itself rather than on the RT Softmotion side.
Here are the issues I'm having:
If I use the PI Velocity Loop with my Velocity and an arbitrary control setpoint velocity, I can see the velocity stabilizes (motor output looks uniform) but I can't correlate it with the velocity setpoint other than a bigger number is faster. Velocity (from the Encoder loop) seems to readback in values of just 0-2 on my FPGA VI (I don't fully understand the units but I see my position change on my encoder readback in thousands of counts per second). Why are they so different/how do I scale my encoder velocity correctly?
Using just the shipping 9505 Servo Drive example (position control), how do I set the velocity of a move from within the FPGA code (in interactive mode)?