OPC90 Server
priority to be established. Note that when running OPC90 as a service and
second instance is attached to that service, only the priority of the serv
changed. The second program instance always remains at the “Normal
Installations having larger databases or OPC clients running at a higher priori
then “Normal” might realize an increase in performance by raising the priority o
OPC90.
5.3.9 Configuration
Shadowing Between Redundant Servers
The configuration shadowing feature can be used to automatically keep th
database and other program features synced between two different PCs running
OPC90 as redunda
a
ice is
” priority.
ty
f
e
nt servers. It also manages CIU online states especially
portant when same addressed CIUs are setup for redundant OPC90 servers
Configuration shadowing must only be used between OPC90 servers of the
predictable results will occur when shadowing between
When operating in runtime mode, it is important to make database changes using
e current OPC90 running as shadow master. This can be determined by
all
r
erver.
n
im
(see more on this feature at the end of this section).
same revision level. Un
two unlike software revision levels.
Configuration shadowing is not supported when the redundant OPC90 servers
are running as a service from the system account. Running as a service from a
privileged user account is supported.
th
looking at the device block “SHADOW_MASTER” tag while in monitor mode.
Configuration shadowing works with the File Import and Export features, and
selections available from the Add and Edit menu selections. Its purpose is to
minimize the engineering effort required to maintain redundant OPC90 servers.
The File | Auto Save feature is not shadowed and must be individually setup fo
each s
Select “Edit->Configuration Shadowing” to enable / disable configuratio
shadowing. When this menu item is selected the following dialog is displayed:
ype the name of the other PC that is running OPC90. Configuration sh
T
is
adowing
enabled when the “Enable configuration shadowing” checkbox is checked. It is
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