Charts that Display Historian Data
With the Vision module Easy Chart component you can create powerful timeseries charts from Tag Historian data. As of 8.1.0, the Perspective module has a Power Chart component with similar capabilities. Both components enable you to drag and drop history-enabled Tags onto a chart to create chart pens and data trends. Your charts and graphs can include subplots, axes, digital offsets, and moving averages. You can quickly and easily turn your historical and realtime data into dynamic charts and graphs for your users. These charts can be configured in the runtime to give users quick access to data in the time range they need.
Store and Forward
The Store and Forward system provides a reliable way for Ignition to store historical data to the database. The Store and Forward system is not exclusively part of Tag history, but systems such as the Tag Historian and Transaction Groups use it to prevent data loss and store data efficiently using a record cache.
Historical Tag values pass through the Store and Forward system before they are stored in the database connection associated with the historian provider. The data is stored according to its data type directly to a table in the SQL database, with its quality and a millisecond resolution timestamp. The data is only stored on-change, according to the value mode and deadband settings on each Tag, thereby avoiding duplicate and unnecessary data storage. The storage of scan class execution statistics ensures the integrity of the data. While advanced users may change the table according to their database to be more efficient (for example, using a compression engine), Ignition does not perform binary compression or encrypt the data.