Historizing Managed Meters

Historizing managed meters refers to the process of storing the historic managed meter data in an XML file for calculating the energy consumption.

When you create a new managed meter and save the entries, the details of the metering point, path, media unit, and offset are historized by default to January 1, 1753. However, when you modify these values and thereafter save the managed meter, the historization is set to the current date and time.

If a managed meter is created below another meter in the view hierarchy, the new meter will be historized by default to January 1, 1753 and not to the historization date of the parent meter.

You must maintain the historic data to handle the following situations:

• Meter Replacements – A managed meter associated with a floor or building is replaced due to fault. In order to calculate the exact consumption details for the floor or building, you must historize the information from both these managed meters. In order to represent a logical replacement of meters, the existing metering point is replaced by the new metering point in the Metering Point field. You may also need to change the value of the media unit if the new metering point uses a different unit of measurement. The information that is historized includes the metering point and the media unit. In case of managed meter replacements, the new metering point and it’s unit of measurement will be historized according to the current date and time.
• Meter Movements – A managed meter that is associated with a particular floor of a building for a certain time period is moved to a different floor. When you save the destination aggregator node, the path of the managed meter is historized according to the current date and time. You will need to manually historize the managed meter to reflect its removal from the source aggregator node.
• Meter Rollover – A meter rolls over to 0 each time after reaching its maximum value. The last value before rollover needs to be set as the Offset value in the managed meter, thereafter, when you save the managed meter the Offset value is historized to the current date and time.
• Any change in the managed meter configuration such as replacement of metering point, change in media unit input, managed meter movement, and setting of new offset value will be historized to the current date and time. However, you can change the historized date and time to the required date and time from the respective historization dialog box.