Why pid control ° Simple, easy to use Wide application: Petrochemical, Pharmaceuticals, Food, Chemical. Aerospace and Semiconductor, etc Robust: Insensitive to changes to plant parameter and disturbance Over 90% control loops are pid with two exceptions 1. On/off control for those with low control requirement loops 2. Advanced control for those difficult systems and with high control quality• Simple, easy to use • Wide Application: Petrochemical, Pharmaceuticals, Food, Chemical, Aerospace and Semiconductor, etc. • Robust: Insensitive to changes to plant parameter and disturbance. Why PID Control Over 90% control loops are PID with two exceptions: 1. On/off control for those with low control requirement loops 2. Advanced control for those difficult systems and with high control quality