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OPC-10000-11 – OPC Unified Architecture - Part 11: Historical Access

4.6 Bounding Values and time domain

value of null, a timestamp of the specified StartTime , and a StatusCode of Bad_BoundNotFound. LAST stands for a tuple with a value of null, a timestamp of the specified ... EndTime , and a StatusCode of Bad_ BoundNotFound . In some cases, attempting to locate bounds, particularly FIRST or LAST points, can be resource intensive for Servers . Therefore, how far back