An external representation based modelling for non conventional sampled-data systems

In the present communication a modelling methodology for non-conventional sampled-data systems based on the external representation is proposed. This technique permits the consideration of any cyclic sampling pattern on the sampled process. Non-conventional modelling is required when, due to several aspects (resource sharing, task priorities, etc), delays appear in a real-time control system. Then, these delays can be considered in the modelling step, and, in a later one, a non-conventional controller can be designed, which generates correct control actions according to the time instant in which they arrive to the process.