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About Delta Logging

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For consumption values, shortBrandName is capable of displaying data from either a totalized history or a delta history. In shortBrandName, delta values offer significant advantages over totalizing values when data editing is necessary. Therefore, you may want to use delta values.

A totalized value is taken from the meter reading at the end of each interval and is easily identified as each consecutive value in the history log is larger than the previous value. Therefore, “delta value” represents the actual consumption that was recorded for the period. In order to use delta logging in shortBrandName, a delta value property must be added to the appropriate point component in NiagaraAX Workbench so that the values in shortBrandName are correctly displayed when they are brought into shortBrandName.

The procedure to use delta values is as follows. A slot must be added to the Config or Config Overrides.

Adding a slot for delta logging

In order to use delta logs in shortBrandName, you need to add a “useDelta” slot to the Config Overrides Component of the History Import descriptor .

1. In NiagaraAX Workbench nav tree, double-click on the history file that you are interested in importing.

   The History Import property sheet view displays, as shown in Figure 3-57.

Figure 3-57 History Import descriptor property sheet view

2. In the property sheet view, right-click on the Config Overrides component and select Views > Slot Sheet from the popup menu (Figure 3-58).

Figure 3-58 Selecting slot sheet view of Config Overrides component

The Slot Sheet view displays.

3. Right-click in the Config Overrides Slot Sheet view, and select Add Slot from the popup menu.

   The Add Slot dialog box displays over the slot sheet view, as shown in Figure 3-59.

Figure 3-59 Adding a slot

4. In the Add Slot dialog box, type “useDelta” in the Name field and in the two Type fields select baja (left drop-down list) and Boolean (right drop-down list). Click the Ok button to add the slot.

   The “useDelta” slot is added to the component and visible in the slot sheet view, as shown in Figure 3-60.

Figure 3-60 Slot sheet with useDelta slot added

The “useDelta” boolean property is now available in the Config Overrides component and it is visible in the property sheet view, as shown in Figure 3-61.

Figure 3-61 Property sheet with useDelta slot added