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Image processing algorithms for industrial systems tend to be very complex and specialised to the particular case. We present a new way of modeling image-processing algorithms for distributed systems using high level Petri-nets. We present the modeling of image-processing as dataflow networks of basic building blocks. Petri nets seem to be well suited for modeling such dataflow networks. We analyse...
This paper aims at the clarification of the execution of IEC 61499 function block networks. A new event-discrete execution model called "handler-based execution model" (HB-XM) has been introduced for CNet in previous work that enables full automatic code generation for Petri-net based component descriptions [4]. The HB-XM abstracts from the CNet language elements and specifies how each element...
We defined the so-called "handler-based execution model" as a real-time capable execution model for CNet [H. Wurmus, 2002] [N. Hagge and B. Wagner, 2005]. Traditional controller implementations typically consist of big loops with a fix sequential execution scan order. This was not appropriate for Petri-net based CNet that is characterized by a high degree of concurrency and locality. Our...
As an alternative to Statecharts and IEC 61499, which usually support implementations in C or IEC 61131, respectively, we have defined CNet to allow Petri net based graphical design and generation of Java code. CNet is a component-based conception for designing modular, concurrent and distributed control systems. The components can be reused and their event-discrete behavior is described by a special...
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