Safe PLC Controller Implementation IEC 61131-3 Compliant based on a Simple SAT Solver: Application to Manufacturing Systems

Romain Pichard (1) , Philippot Alexandre (1) , Bernard Riera (1)

1 CRESTIC - Centre de Recherche en Sciences et Technologies de l'Information et de la Communication - EA 3804

In this study, manufacturing systems are considered as Discrete Event Systems (DES) with logical Inputs (sensors) and logical Outputs (actuators). In previous work, an original implementation of safe controllers (using safety logical constraints) for manufacturing systems, based on the use of a CSP (constraint satisfaction problem) solver, was proposed. However, the proposed solution was not IEC 61131-3 compliant. In other words, it was not possible to implement it in a PLC (Programmable Logic Controller). In this paper, a proof of concept IEC 61131-3 compliant has been carried out. To perform this challenge, an original simple CSP-SAT solver in ST (Structured Text) has been developed and programmed. The algorithm has been tested and validated by using a M340 Schneider Electric PLC and a box sorting simulated process using the FACTORY I/O software from the Real Games Company (www.realgames.co). It seems to be the first time that a SAT solver developed for PLC, is used in real time as a part of a PLC program to get a safe controller.

Mots clés: Constraint Programming; Discrete-Event Systems; Safety; Programmable Logic Controllers; Manufacturing Systems

Domaines: Informatique [cs]; Automatique

Romain Pichard, Philippot Alexandre, Bernard Riera. Safe PLC Controller Implementation IEC 61131-3 Compliant based on a Simple SAT Solver: Application to Manufacturing Systems. International Conference on Informatics in Control, Automation and Robotics (ICINCO), 2018, Porto, Portugal. ⟨10.5220/0006885502310239⟩. ⟨hal-01882564⟩