The j5 OPC connector supports all of the following when it is supported by your OPC server:
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Reading tags at the current time.
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Reading tags at an archived time.
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Reading many tags at the same time.
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Writing to tags when the tags support being written to.
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Subscribing to data changes on tags.
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Fetching a list of possible tags (using the configured root object ID as the root node) for the tag watch list.
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Getting tag history (for charts and plots).
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Tag aggregates are supported based on what aggregates the OPC server supports.