Rockwell Automation T8030S Trusted OPC Server Package - Manual (Page 19)

Trusted
TM
OPC T8030S
Issue 23 April 10 PD-T8030S 19
The Error Log is displayed on the Log tab. The Error Log File setting specifies the file that will be
created when the Save button is used on the Log tab.
The Global Ungrouped Tag Update defines the frequency that tags will be read from the Trusted TM
Controller that are not configured for SOE or Process Historian and do not have a valid group or
update rate specified. Where OPC clients create OPC groups that contain an update rate, that update
rate will be used. Some OPC Clients do not create OPC groups, or they create groups that have an
update rate of zero. In these situations, the Global Ungrouped Tag Update will be used. More
information on the OPC timing settings is given in Section 2.4.5, Server Timing.
The Database Cache Folder stores the server’s copy of the state of all OPC data. This is normally
stored in the OPC program directory as above but may be moved if required.
The OPC Root Name is the left hand end of the OPC tag names as reported to clients. Thus, in the
following example, the tag names will be presented as:
TrustedEthernetIF.<controller>.<tagname>
and the OPC Root Name is TrustedEthernetIF.
The check box ‘Alarms and Events Source contains full tag path’ specifies if the source field in an
Alarms and Events event should contain the full tag path which includes the controller name, or should
only contain the tag name. When the check box is checked, the full tag path will be included in the
events.
Some OPC clients add a subscription for each instance of a tag that they are using, and remove the
subscriptions relating to instances that are no longer used. By default, the OPC server enables data
updates when a subscription is added, but cancels data updates when a subscription is removed, with
no counting of active subscriptions per tag. Therefore data updates are lost when the OPC client
removes a subscription, even if it had another active subscription to that tag. To allow compatibility with
these clients, a new option has been added in CD build 108. If 'Multiple Subscriptions' | 'Allow from
same server and same group' is checked, the OPC server will count subscriptions to each tag and only
cancel data updates when the last subscription is removed. If the option is not checked, the OPC
server will cancel data updates on any subscription removal (as required for most OPC clients).
Another new option in CD build 108 is visible but greyed out on the 8030 OPC server. The OPC Server
Status option is only available in P8032 OPC server.
If any of the settings for the server are changed, the settings must be saved and the server must
be restarted. To save the settings, click the disk icon (shown left) or select File | Save. On
saving a change, the config tool reminds the user that changes to settings will not take effect until the
server is restarted. Refer to section 2.3 above for the methods available to restart the server. Note that
some clients will then also need to be restarted in order to be updated.