Knowledge Base

If you have rights to acess to the Audits and Diagnostics dialog box, available since PcVue version 11, then you can display the monitoring tab in order to see which manager is saturated (“Pending in mailbox” counter value must be very high):

Thanks to the Application Explorer, you can also add some system variables in order to monitor that information in the project:

If you don’t have this possibility you can find the information in Audit files by searching “pending” keyword. You will probably find some big values for some managers and it gives some clues to fix the issue:

In the same Audit file, if we look forward we can see that flow regulation is activated for LON and BACnet protocols. We also observe that there are many pending messages and many lost transitions:

It is important to note at what time the problem appears.
In this specific case it was always during the night. Looking at the traces and audit files we could conclude that the network was disrupted during the night. It generates a lot of alarms, then a lot of Scada Basic treatments, then memory consumption increases, then a crash.
In this picture we can see the relations between several audit counters: