Process e.g. forwarding electronic mail to person, monitoring method, involves requesting diagnosis information from field device by monitoring unit, when communication frame with information is determined with diagnosis result indication

摘要

The method involves communicating a set of field devices (F1-F4) with a process controlling unit and a system monitoring unit by a field bus (FB) of a process automating technology. A continuous data communication at the bus is monitored by the monitoring unit, where the bus serves for process controlling. A frame of the data communication with information is tested, where the information indicates a diagnosis result of one of the devices. Diagnosis information is requested from the concerned device by the monitoring unit, when the frame is determined with the indication of the result.