![]() ![]() Given the amount of extra data in the database that this would lead to, it's important to only change this property when necessary. Setting the value to 1, for example, would cause the Tag value to be inserted each execution, even if it has not changed. By modifying these settings, it is possible to specify the maximum number of scan class execution cycles that can occur before a value is recorded. By default, an "unlimited" amount of time can pass between records – if the value doesn't change, a new row is never inserted in the database. Normally Tag Historian only stores records when values change. Id3 editor save profile update#Typically, the Historical Tag Group should execute at the same rate as the Tag's Tag Group or slower: if a Tag's Tag Group is set to update at a 1,000ms rate, but the Historical Tag Group is set to a Tag Group that runs at 500ms rate, then the Tag History system will be checking the Tag's value twice between normal value changes, which is unnecessary. It uses the same Tag Groups that dictate how often your Tags should execute. Historical Tag Group setting determines how often to record the value on the Tag. Historical Tag Group setting shows up with Sample Mode is set to Tag Group. Tag Group - Collects a record based on the Tag Group specified under the Historical Tag Group property. ![]()
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