Specifies with tag should be data logged for Historical Trending. A file will be created on the SCADA node hard drive to record data for this tag. Fastest record rate is once/second. A Data Log Deadband is applied before writing to file. If the change in the Tag's value from last record exceeds deadband, then a new record is written (record-by-exception).
Data can be viewed in a Data Log Trend Group Display, up to 12 tags per Data Log Trend Group Display. A file is created for each tag allowing tags to be added or removed from Data Log Trends without loosing historical data