1. Evolution

1.1 GRAFCET creation

In 1975, an AFCET working group (note 1) led by Michel Blanchard, made up of industrialists and academics, entitled "Logic Systems", set up a "Standardization of the representation of logic automation specifications" commission. The aim was to define a simple "formalism", suitable for representing the sequential evolutions of a system, understandable by both specifiers and operators, and potentially facilitating the transition to hardware and/or software realization of the automatism. Initially, the work consisted in drawing up a state of the art of the various approaches to modeling the behavior of such automated systems. This work led to the definition of GRAFCET, so named to mark both the origin of this new modeling tool (grAFCET) and its identity (GRAphe Fonctionnel...