主权项 |
1. An Industrial Automation and Control System SACS controlling an industrial process with a process structure including two zones connected via a connecting primary device, the IACS including a number of communicatively interconnected Intelligent Electronic Devices IEDs, with low level IEDs interacting with primary devices of the industrial process, and with two high level IEDs each implementing high level functions on behalf of one of the two zones, respectively,
characterized in that the IACS includes a logical communication link between the two high-level IEDs to transmit, in case of unavailability of a connecting IED interacting with the connecting primary device, process information originating from a first of the two zones and relevant for a high level function on behalf of a second of the two zones. |