A multi-level reconfiguration control for holonic PLC
Xiaokun Zhang, Douglas H. Norrie, Robert W. Brennan, Yuefei Xu · 2002
The system architecture for a holonic PLC (HPLC) is presented and the multi-level reconfiguration control mechanism for a function block (FB)-based PLC is detailed. Based on IEC-1499 FB model concepts, the concurrent process mechanism for FB configuration control and FB process control is put forward. In the presented approach, the dynamic reconfiguration control of the HPLC is handled at three control levels: function, component, and task control. Separating configuration control at the component level from task level facilitates a code-based component maintenance and task state transition process. It can carry out on-the-fly control for the HPLC by means of task level operation and smooth state transition cooperating with associated class maintenance under the limited capability of object oriented class dynamic configuration.