gain Kcu and the ultimate period Pu for control of a FOPDT process with a
deadtime of 30 seconds and a process time constant of 50 s.
Use the Ziegler-Nichols rules to tune a PI controller, providing Kc and reset
time. Plot (a) the open loop response to a step-change in setpoint without
control (b) the closed loop response to a step-change in setpoint without
control, and (c) plot the closed-loop response to a step-change in setpoint with
the ZN tuned controller.
Fig: 1