Rockwell Automation FactoryTalk View Site Edition Users Guide - Manual (Page 367)

14 • S ETTING UP F ACTORY T ALK SYSTEM AVAILABILITY
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Choosing to switch to the primary server means the primary server is always preferred. If
you select this option, you cannot manually change the Active and Standby servers.
If you choose not to switch back automatically to the primary server, the primary server
will go on standby when service is restored, until the Active secondary server fails.
If that happens, the failover and switch-back cycle begins again.
Notifying clients when switching back to the primary
During a switch back to the primary server, the server notifies connected clients when it is
ready to provide service, and then waits for a specified time period for clients to respond.
After the time period expires, the server becomes active even if there are clients that have
yet to respond.
The predefined amount of time the server waits before becoming active is two minutes.
You can change the time period, by modifying the system policy setting, Maximum delay
before server is active.
To change the time a server waits becomes active
1. In FactoryTalk View Studio, in the Explorer window, expand the System folder,
double-click the Policies folder, and then double-click the System Policies folder.
2. Double-click Health Monitoring Policy, and then select Maximum delay before
server is active.
3. Click the number of minutes. To select another number, click the up or down arrow
beside the number.
Modifying HMI tag and alarm properties at run time
You can make changes to HMI tags and their alarm properties while a FactoryTalk
View SE network distributed application is running, and have those changes take effect
without restarting clients.
This means that you don’t have to stop HMI servers or the application from running, in
order to make or deploy these changes. Critical application components can remain
available to connected clients, while you are updating the HMI servers.
Modifying HMI tag properties
In FactoryTalk View Studio, in the Tags editor, you can modify the properties of HMI tags
while an application is running.
The policy setting, Maximum delay before server is active, applies only during a switch back to
the primary server. It does not apply when the system is failing over to the secondary server.