Distributed online change for IEC 61499

Future automation systems exhibit a growing demand for downtimeless evolution. There have been already several approaches for this so called online change but most of them are manly designed to work within a device. The increasing distribution of automation systems needs an efficient mechanism for downtimeless reconfiguration even if the change affects more devices. So this paper will show an approach how this distributed online change can be done for IEC 61499 systems. Distributed reconfiguration needs a synchronisation of the involved devices which will be done in this approach by synchronised clocks. The basis for this paper builds an existing approach for downtimeless reconfiguration (eCEDAC-Approach) which will be extended to get an efficient mechanism for distributed online change.