GF_MMAR_aug_2003
 Frey, G.:
An Integrated Approach for the Development of Logic Controllers Based  on Signal Interpreted Petri Nets.
 Proceedings of IEEE MMAR 2003, Miedzyzdroje (PL), pp 831-836, Aug. 2003.         
-          In this contribution an integrated design approach for logic  control systems is presented.         The approach is based on Signal Interpreted Petri Nets (SIPN), a  Petri Net model extending         condition event nets with means for the input and output of  signals. The presented method         starts from an informal description of the controller and  proceeds over the steps design,         formal verification and validation (V&V), evaluation of  software quality, simulative validation,         and automatic code generation for PLCs to an implemented  controller. After implementation,         the monitoring of the running controller by visualization of the  token flow in the Petri net         is possible.