Rockwell Automation FactoryTalk View Site Edition Users Guide - Manual (Page 350)

F ACTORY T ALK V IEW S ITE E DITION U SER ’ S G UIDE
14–6
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What happens if a non-redundant HMI server fails
An Active, non-redundant HMI server might fail due to any of the following conditions:
 The HMI server is shut down with its host computer, from the Start menu.
 The HMI server is disconnected from the network. For information about how the
system monitors network connections, see page 14-31.
 The HMI server is found to be unhealthy, because an essential service has stopped
functioning.
 The HMI server’s host computer has a power failure.
When an HMI server fails, if the server is not set up with redundancy, it is taken out of
service. Within 5 seconds, Diagnostic messages are logged at connected client computers,
notifying operators of the failure.
Clients that were connected when the failure occurred will continue to run, using a local
cache of directory information.
However, any data or services the failed HMI server provides, such as HMI tag values,
derived tags, command processing, or data logging, will be unavailable. For example,
graphic objects connected to HMI tags in the server’s database will show in outline form.
If connected clients are receiving data from other HMI or data servers, that service will
not be interrupted.
When the failed HMI server is restored, all connected clients in the system can resume
receiving data from the server, without having to be restarted.
Active (Can’t reach partner) The server is ready to provide service to clients,
but its partner is not ready or cannot be located.
This state is also shown if the Active server’s
partner has not been defined.
Standby The Standby server is ready to accept client
connections and provide service to clients, in the
event that the Active server fails.
If the Active server fails, the Standby server’s
status will change to Active (Can’t reach partner)
and the Standby server will provide service to
connected clients.
Not configured A secondary server is not configured.
A server with this status Has these characteristics