PROFINET Component Model (PROFINET CBA)
A PROFINET CBA system consists of various automation components. One component covers all mechanical, electrical and IT variables. The component can be generated using the standard programming tools. A component is described using a PROFINET Component Description (PCD) file in XML. A planning tool loads these descriptions and enables the logical interconnections between the individual components to be generated for implementing a plant.
This model was largely inspired by the IEC 61499 standard.
The basic idea of CBA is that an entire automation system can in many cases be divided into autonomously operating subsystems, thereby arranging them very clearly. The design and the functions can actually end up in identical or slightly modified form in several systems. These PROFINET components are usually controlled by manageable number of input signals. Within the component, a control program written by the user executes the required function within the component and passes the corresponding output signals to another controller. The engineering that is associated with it is manufacturer-neutral. The communication of a component-based system is only configured, instead of being programmed. The communication with PROFINET CBA (without real time) is suitable for bus cycle times of approx. 50 ... 100 ms. The parallel running RT channel allows for data cycles similar to PROFINET IO (a few ms).
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