2. Logical equation of a step
Here we show the basic principles for establishing the logical equations of GRAFCET steps and associated actions, introducing on/off modes.
2.1 Reminder of evolution rules
The syntax of GRAFCET is the subject of a standard (NF C03-190) and is based on five evolution rules that define the active or inactive character of a GRAFCET step.
Rule 1: Initial situation
Initialization specifies the active steps at the start of operation. They are activated unconditionally and marked on the GRAFCET by doubling the sides of the corresponding symbols.
Rule 2: crossing a transition
A transition is either enabled or disabled. It is enabled...
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