S. Hasnaoui∗
Publish/Subscribe/Distribute paradigm, DAIS specification, IDEC’s micro3 PLC, DDS, OLE for process control data exchange specifi- cation, performance analysis
Distributed computer control in complex embedded systems and their software components gain complexity when these systems are equipped with many microcontrollers which oversee diverse elec- tronic control units connecting hundreds or thousands of analogue and digital sensors and actuators. These systems need new inter- object communication patterns. The Publish/Subscribe paradigm matches well with these patterns. This paradigm is extremely at- tractive for structuring object-oriented Distributed Control Systems (DCS). The Data Acquisition from Industrial Systems (DAIS) speci- fication proposed by the OMG Manufacturing Task Force provides a middleware for DCS with a data acquisition specification. The main objective of this paper is to demonstrate how DAIS specification is projected in a Publish/Subscribe point of view and gives a concrete example in a real world application using IDEC’s micro3 PLC in a computer link system [1]. This paper also gives some performance analysis and comparisons to other competitive Publish/Subscribe models like the OMG’s Data Distribution Service (DDS) and OLE for Process Control Data eXchange specification (OPC-DX), widely adopted in distributed and real-time intelligent control systems.
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