Supervisory Control Synthesis for Safety PLCs

Reijnen, F.F.H.; Erens, Toby R.; Mortel-Fronczak, J.M. van de; Rooda, J.E.

doi:10.1016/j.ifacol.2021.04.015

Cited by 7 publications

(5 citation statements)

References 16 publications

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“…Therefore, safety PLCs are widely used, containing diagnostic functions to detect internal faults in the hardware and avoid unsafe situations that could be caused by such faults. A safety PLC implementation can be generated automatically from a (synthesized) supervisor [13]. This method was used to generate controller code for the Oisterwijksebaanbrug, a rotating bridge 4 IEEE Computer in the Wilhelmina canal, which was successfully employed for real-life operation of the bridge [14].…”

Section: Fault-tolerant Supervisorsmentioning

confidence: 99%

Supervisor Synthesis: Bridging Theory and Practice

et al. 2022

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Supervisor synthesis is a classical approach from the eighties to automatically generate a controller for a discrete-event system, ensuring its safe operation. In recent years, owing to important improvements, the applicability of supervisor synthesis has increased significantly. We discuss some notable new developments that were pivotal in the application of supervisor synthesis to large infrastructural systems.

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Section: Fault-tolerant Supervisorsmentioning

confidence: 99%

Supervisor Synthesis: Bridging Theory and Practice

et al. 2022

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“…There have also been contributions in literature towards acquiring distributed controllers through synthesis. [13] discusses a method for synthesizing and implementing a supervisory controller for safety PLCs. In safety PLCs, the controller consists of a regular and a safety controller, which communicate through internal data buffers.…”

Section: B Distributed Supervisorsmentioning

confidence: 99%

Synthesis and Implementation of Distributed Supervisory Controllers with Communication Delays

Schouten¹,

Moormann²,

Mortel-Fronczak³

et al. 2021

Preprint

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In literature, extensive research has been done with respect to synthesis of supervisory controllers. Such synthesized supervisors can be distributed for implementation on multiple physical controllers. This paper discusses a method for distributing a synthesized supervisory controller. In this method, dependency structure matrices are used to distribute a system, the supervisor is then distributed accordingly, using existing localization theory. The existence of communication delays between supervisory controllers is unavoidable in a distributed application. The influence of these delays on the behavior of a supervisor is therefore studied using delay robustness theory. This paper introduces the use of mutex algorithms to make the distributed supervisor delay-robust. A case study is used to demonstrate the method and hardware in the loop testing is used to validate the resulting distributed supervisor.

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“…For a safety PLC implementation, the supervisory controller has to be split into a regular and a safety part. In [27], a method is presented that automatically performs this split. It has been used to generate controller code for the Oisterwijksebaanbrug, a rotating bridge in the Wilhelmina canal at the city of Tilburg, which was then successfully employed for real-life operation of the bridge [32].…”

Section: Continuous-time Simulationmentioning

confidence: 99%

The Road Ahead for Supervisor Synthesis

Goorden

Moormann

Reijnen

et al. 2020

Lecture Notes in Computer Science

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Supervisory Control Synthesis for Safety PLCs

Cited by 7 publications

References 16 publications

Supervisor Synthesis: Bridging Theory and Practice

Supervisor Synthesis: Bridging Theory and Practice

Synthesis and Implementation of Distributed Supervisory Controllers with Communication Delays

The Road Ahead for Supervisor Synthesis

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