For some industrial processes a small stationary control error or smooth oscillations of the process output around the set-point do not constitute hard design constraints but, however, the reduction of the information exchanged between the agents that take part in the control loop (sensors, controllers, actuators) is one of the tightest requirements. This is especially true when wireless sensos and actuators are employed, as the reduction of transmissions increases the lifetime of the batteries. With these demands, one of the most convenient strategies is the use of event-based sampling and control approaches. As PID controllers are the most employed in industry, during last years event-based PID controllers have been widely investigated. In this talk the main contributions will be reviewed and the main practical issues will be highlighted, showing that this kind of controller can be successfully applied by still exploiting the typical knowledge of industrial operators.