Logical equation of a step
Technological implementation of GRAFCET
Article REF: S8032 V1
Logical equation of a step
Technological implementation of GRAFCET

Authors : Daniel DUPONT, David DUBOIS

Publication date: March 10, 2002 | Lire en français

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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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