A Design and Implementation of Object-oriented Distributed Manufacturing Line Monitoring and Maintenance System

摘要

This paper discusses the object model of PLC designed for manufacturing line monitoring and maintenance, and investigates the architecture and performance of di8tributed object management middleware to communicate between designed PLC objects. We designed PLC related objects from two viewpoints. We designed hardware related objects which are modeled from physical control devices of PLC for remote maintenance and management. And we designed memory related objects which are modeled from internal calculation resources in PLC for monitoring manufacturing line status. Modeling of I/O device is aimed to be applied to autonomous device that is directly connected to network. Our distributed object management middleware is based on OMG CORBA and is able to be implemented to PLC to which CPU and memory performance is restricted. We evaluated proposed PLC model and distributed object management middleware from the viewpoint of necessary memory capacity. and response time. nom that evaluation our PLC model and middleware is effective to distributed manufacturing line monitoring and maintenance system.