Wireless Control Foundation

Continuous and Discrete Control
for the Process Industry

Model Based Wireless Control – Smith Predictor

Exercise

This workshop provides several exercises that can be used to further explore model based control using a wireless measurement. The module used in the workshop allows the control performance of a PID with a wired input to be compared to a Smith Predictor with a PID using a wireless input.

Step 1: Open the module containing a Smith Predictor with a wireless measurement and PID with a wired measurement.

Step 2: Initialize the Performance Index (IAE) and then change the SP parameter of both control loops by 10%. Observe the control response using a plot of the setpoint, control measurements and output.

Step 3: Note the IAE and the number of communications for the wireless and wired control. You should see a significant difference in the number of communications for wired vs wireless control that were required to respond to the setpoint change.

Step 4: Initialize the Performance Index and change the Disturbance input from zero to 10. Observe the response of the PID and the Smith Predictor to this unmeasured process disturbance.

Step 5: Note the IAE and the number of communications for the wireless and wired control.