The Services element within the SCL allows defining the capabilities of an IED. It does it so through several child elements and grandchild elements. With the new upcoming concept of a virtual IED, the Services can also be used to define wishes regarding the capabilities of an IED. The element Services can be allocated to an IED or to one or more access point of the IED at the same time. This allows to define the global IED capabilities and capabilities per access point. Let's assume we are talking about an IED that has two ports. One is designed to be connected to the process bus and the other one to be connected to the station bus. In such an IED, you might find three Services elements. The first one is a child of the IED and defines the GOOSE capabilities, as this service is required on both the ports. The second one to define the capabilities of the process bus port, containing sampled values capabilities. The third on defining Report capabilities or other client server type services.
DataSets
There are three settings regarding DataSet capabilities within the IED and they are all attributes of the element ConfDataSet.
- maxAttributes: is an integer that tells how many attributes (FCDA elements) a DataSet element can have at max.
- max: shows how many DataSet element can be defined for the IED or the access point.
- modify: indicates whether DataSet element can be modified with an SCL editor.
The default values in case ConfDataSet is not present are
- maxAttributes: not restricted by definition, only by the size of the Ethernet packet with GOOSE and sampled values
- max: the amount of DataSets already defined in the IED or access point, respectively. This basically means you cannot add new DataSets with the SCL editor
- modify: true. Existing DataSets can be changed.