<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>47</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">J. Machado</style></author><author><style face="normal" font="default" size="100%">E. Seabra</style></author><author><style face="normal" font="default" size="100%">José Creissac Campos</style></author><author><style face="normal" font="default" size="100%">F. Soares</style></author><author><style face="normal" font="default" size="100%">C. Leão</style></author><author><style face="normal" font="default" size="100%">J.F. Silva</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Simulation and Formal Verification of Industrial Systems Controllers</style></title><secondary-title><style face="normal" font="default" size="100%">19th International Congress of Mechanical Engineering - COBEM</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2007</style></year><pub-dates><date><style  face="normal" font="default" size="100%">November </style></date></pub-dates></dates><urls><related-urls><url><style face="normal" font="default" size="100%">https://haslab.uminho.pt/sites/default/files/jccampos/files/publicacao_-_ssm3_iii_09_-_publicado_em_2008.pdf</style></url></related-urls></urls><publisher><style face="normal" font="default" size="100%">ABCM</style></publisher><pub-location><style face="normal" font="default" size="100%">Brasília, Brazil</style></pub-location><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Actually, the safety control is one of the most important aspects studied by the international researchers, in the field of&lt;br /&gt;
 design and development of automated production systems due to social (avoid work accidents, ...), economics (machine stop time&lt;br /&gt;
 reduction, increase of productivity,...) and technological aspects (less risks of damage of the components,...). Some researchers of&lt;br /&gt;
 the Engineering School of University of Minho are also studying these aspects of safety control, using simulation and modelchecking&lt;br /&gt;
 techniques in the development of Programmable Logic Controllers (PLC) programs.&lt;br /&gt;
 The techniques currently used for the guarantee of automated production systems control safety are the Simulation and the Formal&lt;br /&gt;
 Verification. If the Simulation is faster to execute, has the limitation of considering only some system behavior evolution scenarios.&lt;br /&gt;
 Using Formal Verification it exists the advantage of testing all the possible system behavior evolution scenarios but, sometimes, it&lt;br /&gt;
 exists the limitation of the time necessary for the attainment of formal verification results. In this paper it is shown, as it is possible,&lt;br /&gt;
 and desirable, to conciliate these two techniques in the analysis of PLC programs. With the simultaneous use of these two&lt;br /&gt;
 techniques, the developed PLC programs are more robust and not subject to errors. It is desirable the use of simulation before using&lt;br /&gt;
 formal verification in the analysis of a system control program because with the simulation of some possible system behaviors it is&lt;br /&gt;
 possible to eliminate a set of program errors in reduced intervals of time and that would not happen if these errors were detected&lt;br /&gt;
 only through the use of formal verification techniques. Conciliating these two techniques it can be substantially reduced the time&lt;br /&gt;
 necessary for the attainment of results through the use of the formal verification technique.&lt;br /&gt;
 For the analysis of a system control program for simulation and formal verification it is used the Dymola for the Simulation&lt;br /&gt;
 (through the creation of system models with Modelica language) and UPPAAL (through the creation of system models with timed&lt;br /&gt;
 automata).&lt;/p&gt;
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