FPGA PID Gains

[andyrward]

Hi all,

Just wanted to check if I'm sending the right gains to FPGA Descrete PID.  384 would be a gain of 1.5?

Thanks,
Andy

[griffindore]

Hi Andy,

The PID (FPGA) Help states, "The Express VI represents the PID proportional, integral, and derivative gains as 16-bit integers, where the upper 8 bits represent the integer part and the lower 8 bits represent the fractional part." Kp = Kc * 2^8. When Kc = 1.5, Kp will equal 384.

If you go to the PID (FPGA) Configuration, you can type in the initial gains (Proportional gain Kc = 1.5) and it will show the calculated Proportional gain (scaled) (384). I hope that helps!