These allow you to configure a model attribute to point to another model attribute. This is especially powerful when used in conjunction with templates.
For example, let’s say you have a template for an equipment that has flow meters at its inlet and outlet. You configure a template metric with two model attributes named "Inlet Flow Meter" and "Outlet Flow Meter". The idea is that when you instantiate this metric, you'll configure these model attribute values with the respective tag names from the data source.
Within the template metric, you have two measures for each of the flow meters.
These measures themselves are derived from a base flow meter template measure. The base flow meter measure is configured as follows:
When this base flow meter measure is derived within the template metric, you can now configure the “PV Tag” model attribute to reference the respective model attribute in the template metric. . This is done by using the placeholder [ModelAttribute("The Other Model Attribute Name")].
When the template metric is instantiated, and the “Inlet Flow Meter” and “Outlet Flow Meter” have been given their respective values, the flow meter measures will look up the corresponding values and replace their PV Tag accordingly.