Issue
How to configure an alarm to see when controllers go offline.
Environment
Continuum
Continuum Controllers
Cause
Want to see an alarm when controllers go offline / online.
Resolution
There is a default EventEnrollment already created that does this.
To setup controller offline alarms, do the following:
- Go to the "Templates" folder in Continuum Explorer where a number of default EventNotifications are found.
- Open the "ControllerStatus" EventNotification and go to the Delivery tab.
- Add in the Workstations that where this alarm is to be sent too.
Now any time a controller goes offline or comes back online, an alarm entry will be received at the Workstation entered in step 2.
The other EventNotifications in this folder can be used to provide alarms on the subnet controllers status (InfinetStatus), IOU modules (IOModuleStatus), etc...
***Important:
CyberStations detect controller’s offline status via a mechanism that periodically probes the controllers for their communication statuses; the default period for the probe is 60 seconds. If data is consistently being passed then no probe goes out. A Probe will go out if the controller has not heard from the other controller after a minute and no data has been passed. If an ACK is not received then it will try 3 more times with a 5 second delay after each retry. If it does not get a response after the 3rd retry then it will mark the controller offline and register a node failure alarm.
If a controller goes offline for a short period of time (60 seconds or less) it is possible that not all recipient CyberStations will see the controller offline. If the CyberStation designated as the logging CyberStation for the ‘ControllerStatus’ alarm misses the offline condition the alarm WILL NOT be logged in the database.
