The FESTO MPP Case-Study

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Introduction
FESTO MPP

The control application

FESTO MPPSimulator

References

This case study was done in close cooperation with the university of Helsinki, Information & computer systems in automation department.

Introduction
To demonstrate the applicability of the IEC61499 Function Block model in the Batch process industry and prove the effectiveness and usability of :

1. IEC61499 compliant FB execution environment (J2SE-AXE) [1],

2. tool infrastructure (CORFU ESS and Archimedes System Platform) [2][3] and

3. development process, 

the FESTO MPP example application was developed.

FESTO Mini Pulp Process
The Festo Mini Pulp Process is a simplified laboratory version of the liquor circulation in pulp and paper processes. The system that is shown in fig. 1 is based on a number of physical modifications and extensions to Festo didactic Mini Pulp Process (MPP) system (http://www.festo-didactic.com). The liquor circulation was first described textually and then specified with the graphical PFC notation. The PFC specifies four levels: procedure, unit procedure, operation and phase. Each level is implemented with one or more constructs from the lower level. For example, a phase might open or close a valve and an operation might open a route from one tank to another involving several valves. A unit procedure contains the sequence for one part of the process such as filling a tank or cooking under certain temperature and pressure. The example procedure was composed of a sequence of five unit procedures: impregnation, black liquor fill, white liquor fill, cooking and discharge. [1]

Figure 1. The schematic diagram of Festo MPP system.

The control application

The development of the control application was achieved using the CORFU ESS and Archimedes System Platform. The UML design diagrams were constraycted using IBM ROSE but any other UML CASE tool can be used. 

Figure 2.   Example Object Interaction Diagram for Festo MPP

UML diagrams were imported into Corfu fbdk and transformed to equivalent IEC61499 design diagrams (FB types and FB network diagrams). Figure 3 presents an example FB network diagram that was automatically generated by the Corfu transformation facility manager.

Figure 3.  FB Network in Corfu FBDK

FESTO MPP Simulator

In order to debug and demonstrate the Festo MPP control application a simulator was created, using a tcp socket interface to interact with the control application. The connection interface was build to be as close as possible with the physical process connection interface (which uses the CAN Open interface).

References

Under construction