circa 1980 PLC (Digital Control) PLC (Digital Control) PLC (Digital Control) PID Controller PID Controller PID Controller PID Controller PID Controller PID Controller PID Controller Operator Station Recipe Storage Historical Records Switches, Timers Motors, Pumps, Heaters, Coolers Setpoints Setpoints Speed, Flow, Thickness Speed, Flow, Thickness Mini-Computer Interrupt Bus Event‐Driven Object‐Oriented Edge Computing Events Events PID Controller (Analog Control) 10 1977