There is a growing deployment of wireless networks in industrial control systems. Lower installation costs and efficient system reconfigurations for wireless devices have a major influence on the future application of distributed control. Traditional sampled-data control is based on periodic sensing and actuation rather than the acting when the system needs attention. Event-based control instead is reactive and generates sensor sampling and control actuation when the plant needs it. In this talk, we will discuss how to design event-based control systems. It will be shown how wireless access scheme for can influence the closed-loop performance of the networked control system. It will be argued that the underlying scheduling control problem has a non-classical information structure. Appropriate models for medium access control protocols will be introduced. It will be shown how these protocols can be tuned for various wireless control applications. The talk will be illustrated by several examples from ongoing projects with Swedish industry. The presentation is based on joint work with several collaborators.