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Proceedings Paper

Modeling safety requirements of an FMS using Petri-nets
Author(s): Moheb Maurice Hanna; A. A. Buck; R. Smith
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Paper Abstract

This paper is concerned with the modelling of safety requirements using Petri nets as a tool to model and simulate a Flexible Manufacturing System (FMS). The FMS cell described comprises a pick and place robot, a multi-head drilling machine together with a vision system and illustrates how the hierarchical structure of Petri nets can be used to ensure that all fail- safe requirements are satisfied; block diagrams together with fully detailed example Petri nets are given. The work demonstrates the use of cell and robot control Petro nets together with robot subnets for the x, y and z axes and associated output nets; the control and output nets are linked together with a safety net. Individual machines are linked with the control and safety nets of an FMS at cell level. The paper also illustrates how a Petri net can act as a decision maker during image inspection and identifies the unsafe conditions that can arise within an FMS.

Paper Details

Date Published: 6 August 1993
PDF: 10 pages
Proc. SPIE 2064, Machine Vision Applications, Architectures, and Systems Integration II, (6 August 1993); doi: 10.1117/12.150301
Show Author Affiliations
Moheb Maurice Hanna, Univ. of Wales College Cardiff (United Kingdom)
A. A. Buck, Univ. of Wales College Cardiff (United Kingdom)
R. Smith, Univ. of Wales College Cardiff (United Kingdom)


Published in SPIE Proceedings Vol. 2064:
Machine Vision Applications, Architectures, and Systems Integration II
Bruce G. Batchelor; Susan Snell Solomon; Frederick M. Waltz, Editor(s)

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