Specifications
15 – Configuring Distributed Server Architecture
344 R400
Alarms for a Remote Area
If you disable alarms for a remote area, the effect is to unsubscribe your local
server from the alarms. The remote server continues to generate alarms, and
other servers that subscribe to it continue to receive them.
Alarm and Message Acknowledgement Policy
By default, alarm acknowledgements are distributed to all servers. This means
that the alarm only needs to be acknowledged once, at any server that displays it.
Remote alarms can be acknowledged in the same way as local alarms, from
custom displays, the Alarm Summary display, and the Station Alarm Zone.
You can configure the Alarm Acknowledgement Policy setting so that alarms
must be acknowledged at each server (refer to “Configuring “This Server”” on
page 352). This setting must be the same on all servers.
Message acknowledgements are always distributed to all servers.
Alarm Message Index
Each Station displays the message text defined on its local server. To ensure that
appropriate messages are displayed for remote points, the alarm message indexes
and text should be the same on all servers.
Journalled Events
Because distributing all journalled events would need significant bandwidth, most
events are recorded only on the server where the point is defined. The
exceptions are Acknowledgement events and Point Value Change events, which
are recorded both on the server where they occurred and on the data owner.
This means that the event archive on each server includes all events for its local
points, and Acknowledgement events and Point Value Change events that
occurred on the local server and affect remote points.
To view events for a remote server:
• The Station can log on to the remote server and view the Event Summary
display.
• If sufficient bandwidth is available an ODBC-based report, using the
PlantScape ODBC Driver, can be constructed to generate a consolidated
event report from multiple servers. The ODBC Driver is included with the
PlantScape Open Data Access option.
plscpcg.book Page 344 Monday, May 28, 2001 10:11 AM