GRAFCET is a standard valid in Europe (DIN EN 60848) which may be used to describe a control function or a machine.
GRAFCET is the abbreviation for
“GRAphe Fonctionnel de Commande Etapes/Transitions.”
Step Transition function chart.
GRAFCET helps to guarantee the best possible, highly efficient working relationships between different professional groups (or disciplines):
The designer creates the GRAFCET and the mechanical engineer can use it to construct the requested machine. Then, the PLC expert writes a program which corresponds to this and the commissioning engineer can prepare the machine for operation. The system operator is better able to understand the machine’s processes using the GRAFCET and maintenance staff can remedy disruptions faster as the system’s functions can gauge faster.
This is the idea behind the standard at the very least.
Things often turn out differently in reality:
Either no GRAFCET at all is created, as this is viewed as unnecessary additional work, or the GRAFCET is created but not synchronised with the programming.
After some time, the programming has nothing to do with the original GRAFCET.
To significantly increase acceptance of GRAFCET, it would be helpful to have a tool with which a GRAFCET could be designed and automatically converted into a PLC program.
These gaps will now be bridged using “GRAFCET Studio” software:
Using GRAFCET Studio, the description language GRAFCET therefore becomes a cross-platform programming language.