Alarms can not be acknowledged version 5.0 Sp2 Rev b / Harmony Connect
Good Morning , please Could you support in the following issue ?
Customer has installed a system version 5.0 Sp2 Rev B , some days ago the system went down because of feed power problems , it included also the Infi 90 controllers.
After that , people has some problems to acknowledge the alarms , all the controllers are up and running nevertheless some alarms can not be acknowlegded , I do not think they have deleted some tags objects which they had alarms configured , and also we could verify the manual inhibit alarm feature from the specific objects to see if the problem goes away , or to clean the alarms could we delete the alarm list from the \OperateITData\EventStorage \ folder to try to reestablish the behavior ? it could be done after restarting both connectivity server nodes , if the problem still continue we could do that
Regarding to delete the folder from OperateITData\EventStorage \ folder , first we could uncheck the service providers from both nodes aspect server/ connectivity server ( in the plant they are combined nowadays) and delete that , as result of this action , how could be showed the alarms from alarm list or alarm line after doing that .
Thanks for your support
Regarding alarm acknowledgement: the HMI is a backseat passenger without anything to say if the OPC AE server refuses to acknowledge.
Removing Event Storage data files is futile here as it only removes the history of alarm and events from *Event* Lists. Also, peforming delete in Alarm Lists is not a long term solution, if the alarm lingers in the OPC AE server or PLC, it will resurface at next refresh (eg at next failover or similar)
Suggestion: Fault trace the OPC AE servers; use 3rd party client to check alarm content. Restart the OPC AE server if neccesary. In some cases (eg in the case with AC 800M) the final decision to acknowledge (or not) is governed by the PLC itself. For some situations, restarting the AC 800M controller is the only viable option to persistently clear the alarm from the HMI.