Abstract
The architecture of a programmable controller especially suited for automation applications of highest safety criticality, i.e., on Safety Integrity Level 4, is presented. Its main characteristics are input conditioning by low resolution analogue-to-digital converters and inference by look-up in cause/effect tables or rule set tables. This programmable electronic system consists of a few elements, only. Thus, it is reliable, safe, verifiable, cheap and small. Owing to the simplicity of both its hardware and software, safety licensing of the controller is facilitated. With regard to software, this can easily be carried out by inspection of the table content. The controller is very fast, with its speed mainly determined by the table access time, and works almost jitter free. Operating in a strictly cyclic fashion, the controller exhibits fully predictable real time behaviour. Its hardware operation is supervised by a fail safe logic immediately initiating an emergency shut-down in case of a malfunction.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Similar content being viewed by others
References
M. E. Fagan: Design and Code Inspection to Reduce Errors in Program Development. IBM Systems Journal 15, 3, 182–211, 1976
R. Hampel, H. Stegemann, F. Worlitz and N. Chaker: Verfahren zur Regelung zeitkritischer Prozesse durch einen High Speed Matrix Controller. (German) Patent-Offenlegungsschrift DE 197 56 507 A 1, July 1999
Draft International Standard IEC 61508-1: Functional Safety of Electrical/Electronic/Programmable Electronic Systems: Generic Aspects — Part 1: General Requirements. Geneva: International Electrotechnical Commission 1998.
H. Krebs and U. Haspel: Ein Verfahren zur Software-Verifikation. Regelungstechnische Praxis rtp, 26, 73–78, 1984
P. Vogrin: Safety Licensable and High Speed Programmable Digital Controllers Providing Any Required Control Behaviour. Fortschr.-Ber. VDI Reihe 8 Nr. 814. Düsseldorf: VDI Verlag 2000, ISBN 3-18-381408-0, ISSN 0178-9546
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2000 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Halang, W.A., Vogrin, P., Colnaric, M. (2000). A Safety Licensable PES for SIL 4 Applications. In: Koornneef, F., van der Meulen, M. (eds) Computer Safety, Reliability and Security. SAFECOMP 2000. Lecture Notes in Computer Science, vol 1943. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-40891-6_13
Download citation
DOI: https://doi.org/10.1007/3-540-40891-6_13
Published:
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-41186-4
Online ISBN: 978-3-540-40891-8
eBook Packages: Springer Book Archive