Telco March 7, 2011

Nathan will provide an example and a proposal for additional text.

I uploaded a *.DOCX that contains a sample graphic and an introductory paragraph. In addition, I would recommend the following changes to the bullet point definitions in 5.12.1.6 "Triggering Model" as follows:

Bullet F:
Current text: "The monitoring mode of the item to report indicates that reporting is disabled. In this case, the item to report is reported when the triggering item triggers."

Proposed text: "The monitoring mode of the item is set to Sampling. In this case the item to report is reported when the Triggering item triggers.".

New Bullet:
"If the Triggering item's mode is set to Disabled, then this disables triggering and no notifications will be received for the trigger or the linked items."

New Bullet:
"If the Linked item's mode is set to Disabled, then the item will not be sampled and will therefore never generate a data-change notification, essentially disabling the linked item."

Enhanced description of rules for the reporting of notifications.

Change is part of the draft version "OPC UA Part 4 - Services Draft 1.02.03 Body.doc"

Sorry to re-open this one...
I don't think that it is fully resolved yet. One last issue remains with regards the question "what constitutes the initial value" after the triggering is created?

For example:

1. create subscription & monitored items
2. create trigger and links
3. wait and call Publish

In the above scenario should that first Publish return the initial values for the items (in this case just the linked items)?
Or, must we wait for the trigger and linked items to change their values (change from the initial value) so that we receive these notifications on the NEXT call to Publish?

Added following sentence to clarify behaviour in
"The first trigger shall occur when the first notification is queued for the triggering item after the creation of the link."

Changed in document version OPC UA Part 4 - Services 1.02.07 Draft.doc

Reviewed at F2F