2. Real-time application

Example

Let's take the case of a fluid level control application in a tank with constant leakage (figure 1 ), where the role of the control system (a control station) is to control the fluid level on the basis of the measurement taken by an analog sensor. This is a command to be executed periodically, the action of which is to adjust the opening of the reservoir supply valve.

This basic function is complemented by two additional tasks:

• switch from open loop to closed loop (and vice versa) on operator command;

• ...