Note: The specs will be shown for the base block of the function block in question.
Until DBDOC version 11.0, live specifications for a block could be shown as a kind of live loop annotation.
Starting in DBDOC 11.1, layered specs have a "live" mode, and live specification values can be seen directly on layered specs.
This is an improvement, because live layered specs are now fetched very rarely (only upon creation, upon change of document, and on manual refresh), as opposed to periodically like a live loop annotation. Since specs very rarely change, but are quite heavyweight communication-wise to fetch, this makes sense.
In all cases, live data is fetched from the connections (generally CIUMon) specified in the Live Loop Setup tab of the Options dialog.
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