๐”– Scriptorium
โœฆ   LIBER   โœฆ

๐Ÿ“

Formal Synthesis of Safety Controller Code for Distributed Controllers

โœ Scribed by Dirk Missal


Publisher
Logos Verlag Berlin
Year
2012
Tongue
English
Leaves
156
Series
Hallenser Schriften Zur Automatisierungstechnik Ser.
Edition
1
Category
Library

โฌ‡  Acquire This Volume

No coin nor oath required. For personal study only.

โœฆ Synopsis


Modern control systems in manufacturing are characterized by rising complexity in size and functionality. They are highly decentralized and constitute a network of physically and functionally distributed controllers collaborating to perform the control tasks. That goes along with a further growing demand on safety and reliability. A distributed control architecture supporting functional decomposition of large systems as well as accommodating flexibility of modular systems is defined.This work describes the formal synthesis of distributed control functions for the sub area of safety requirements. The formal synthesis is applied to avoid the potentially faulty influence of human work through the whole process from the formal specification to the executable control function. Starting points are a formal model of the uncontrolled plant behavior and a formal specification of forbidden behavior. The formulation of the specification and the modeling is exemplified on a manufacturing system in lab-scale.The introduced synthesis methods produce controller models describing the correct control actions to achieve the given specification. The methods use symbolic backward search from a forbidden state to determine the last admissible state before entering an uncontrollable trajectory to a forbidden state. Hence, the determination of the reachable state space is avoided to reduce the computational complexity. The use of partial markings leads to a further reduction. The complexity is an important obstacle for the use of formal methods on real-scale applications. The monolithic synthesis approach is proven to result in maximally permissive results. The modular approach is not maximally permissive but the more efficient way to distributed control functions.The implementation of the generated controller model as executable Function Blocks according to IEC61499 is addressed in the last part of this work. The distributed control predicates are embedded as structured text instruction into different interacting Function Block types according to the distributed control structure. This last step finalizes the sequence from a formal model and the specification to fully automatically-generated executable control code.Moderne Steuerungssysteme sind durch zunehmende Komplexit#65533;t und Funktionalit#65533;t gekennzeichnet. Sie sind stark dezentralisiert und formen ein Netzwerk von physisch und funktional verteilten Steuerungen, die eine gemeinsame Steuerungsaufgabe erf#65533;llen. Diese geht einher mit einem weiter steigenden Anspruch an Sicherheit und Zuverl#65533;ssigkeit. Es wird eine verteilte Steuerungsarchitektur definiert, welche die funktionale Zerlegung gro#65533;er Systeme und die Flexibilit#65533;t modularer Systeme unterst#65533;tzt.Diese Arbeit beschreibt die formale Synthese verteilter Steuerungsfunktionen f#65533;r das Teilgebiet der Sicherheitsanforderungen. Die Anwendung der formalen Synthese vermeidet den potenziell fehlerverursachenden Einfluss menschlicher Arbeit durch den gesamten Prozess von der formalen Spezifikation bis zu Erzeugung ausf#65533;hrbarer Steuerungsfunktionen in Form von Basic Function Blocks nach IEC61499.Die beschriebenen Methoden nutzen die symbolische R#65533;ckw#65533;rtssuche und die Abstraktion von Systemzust#65533;nden zu partiellen Markierungen um die Berechnungskomplexit#65533;t zu verringern. Eine der Methoden liefert minimal einschr#65533;nkenden Steuerungsfunktionen. Die einzelnen Schritte der Synthese sind an einem Produktionssystem in Laborma#65533;stab beispielhaft erl#65533;utert.

โœฆ Subjects


Automatic control-Standards.


๐Ÿ“œ SIMILAR VOLUMES


Formation Control: Approaches for Distri
โœ Hyo-Sung Ahn ๐Ÿ“‚ Library ๐Ÿ“… 2020 ๐Ÿ› Springer International Publishing ๐ŸŒ English

<p>This monograph introduces recent developments in formation control of distributed-agent systems. Eschewing the traditional concern with the dynamic characteristics of individual agents, the book proposes a treatment that studies the formation control problem in terms of interactions among agents

Formal Specification and Synthesis of Pr
โœ Arturo Sanchez ๐Ÿ“‚ Library ๐Ÿ“… 1996 ๐Ÿ› Springer ๐ŸŒ English

The operation of process plants involves a large number of event-driven activities, such as the start-up and shut-down of the plant, the execution of emergency procedures and equipment interlocking. These activities are normally carried out by procedural control systems (such as PLCs or DCSs). Despi

Formal Specification and Synthesis of Pr
โœ Arturo Sanchez Dr (auth.) ๐Ÿ“‚ Library ๐Ÿ“… 1996 ๐Ÿ› Springer-Verlag Berlin Heidelberg ๐ŸŒ English

<p>The operation of process plants involves a large number of event-driven activities, such as the start-up and shut-down of the plant, the execution of emergency procedures and equipment interlocking. These activities are normally carried out by procedural control systems (such as PLCs or DCSs). De

Version control with Git powerful techni
โœ Loeliger, Jon ๐Ÿ“‚ Library ๐Ÿ“… 2009 ๐Ÿ› O'Reilly Media ๐ŸŒ English

<p><em>Version Control with Git</em> takes you step-by-step through ways to track, merge, and manage software projects, using this highly flexible open-source version control system. Git permits practically an infinite variety of methods for development and collaboration, but its flexibility also me

Version control with Git powerful techni
โœ Loeliger, Jon ๐Ÿ“‚ Library ๐Ÿ“… 2009 ๐Ÿ› O'Reilly Media ๐ŸŒ English

<p><em>Version Control with Git</em> takes you step-by-step through ways to track, merge, and manage software projects, using this highly flexible open-source version control system. Git permits practically an infinite variety of methods for development and collaboration, but its flexibility also me

Formal Methods for Control of Nonlinear
โœ Yinan Li, Jun Liu ๐Ÿ“‚ Library ๐Ÿ“… 2022 ๐Ÿ› CRC Press/Chapman & Hall ๐ŸŒ English

<p><span>Formal methods is a field of computer science that emphasizes the use of rigorous mathematical techniques for verification and design of hardware and software systems. Analysis and design of nonlinear control design plays an important role across many disciplines of engineering and applied