limit3 - Follow input signal while obeying limits

       John Kasunich

limit3.N (requires a floating-point thread)

       GPL

LinuxCNC Documentation                             2025-08-07                                          LIMIT3(9)

       limit3 - Follow input signal while obeying limits

limit3.N.in float in
       limit3.N.enable bit in (default: 1)
              1: out follows in, 0: out returns to 0 (always per constraints)

       limit3.N.out float out
       limit3.N.load bit in (default: 0)
              When TRUE, immediately set outtoin, ignoring maxv and maxa

       limit3.N.min float in (default: -1e20)
       limit3.N.max float in (default: 1e20)
       limit3.N.maxv float in (default: 1e20)
       limit3.N.maxa float in (default: 1e7)
              Max  Acceleration.  Note that the component becomes unstable with maxa greater than about 1e7 in a
              1kHz thread

       limit3.N.smooth-steps u32 in (default: 2)
              Smooth out acceleration this many periods before reaching input or max/min limit.   Higher  values
              avoid oscillation, but will accelerate slightly more slowly.

       Limit  the  output  signal to fall between min and max, limit its slew rate to less than maxv per second,
       and limit its second derivative to less than maxa per second squared.  When the  signal  is  a  position,
       this means that the position, velocity, and acceleration are limited.