Trend Logs

With the nE2 Link V1.8 release, the Trends service functionality has been added to the nano EDGE ENGINE operating system.

Note: Using trends for the nEE devices has been described in the Trends Service section.

Niagara Workbench offers a tool to automatically discover trends which are exposed to the BACnet network on the nano EDGE ENGINE device. To do this, go to Trend Logs under the BACnetDevice in the Niagara station:

ne2Link Screenshot

Fig. 1: Trend Logs in the BACnetDevice

Double-click Trend Logs or use the context menu and choose AX Bacnet History Import Manager/Bacnet History Import Manager view.

ne2Link Screenshot

Fig. 2: Trend Logs view

To automatically discover trends available on the nano EDGE ENGINE device, make sure that the device is properly connected to the BACnet network and communicating and use the Discover button.

The view will be split into to parts, Discovered and Database.

ne2Link Screenshot

Fig. 3: Discovered trends

To add trends to the Database, double–click on a trend, which automatically opens the Add pop–up, or mark trends in the Discovered section (click a single trend or use a Shift or Ctrl keys to mark more than one trend) and use the Add button or drag and drop marked trends in the Database section.

The Add pop–up allows to configure trends added to the Database:

ne2Link Screenshot

Fig. 4: Add trend pop–up

The Add dialog window has the following columns:

Name of the trend;
Type;
Object Id;
Execution Time: allows to choose a synchronization method:
- daily: requires additional specification of time, randomization, and days of week,
- manual: can be linked to an action in logic,
- interval: requires additional specification of interval, time, and days of week;
Enabled status of the trend,
Capacity: allows to set a number of records to be saved;
Full Policy: allows to select an action when records limit (if set) is achieved);
On Demand poll status.

it also allows to define additional parameters:

On Demand Poll Enabled: allows to enable/disable an on–demand polling function;
On Demand Poll Frequency: allows to set the on–demand polling frequency;
Time Zone: allows to set a time zone, which will be automatically applied to records;
Local History Name Format: allows to set a naming pattern for the history records;
Discovery History Type: shows the format of history records;
Always Request By Reference Time: allows to set if the trend records should always request against the reference time.

History Charts

Once the trends are correctly added to the Database, it is possible to further use them in the Niagara history tools, for example, AX History Chart Builder.