P54x/EN SC/La4 SCADA Communications
(SC) 13-28
MiCOM P543, P544, P545 & P546
Figure 7 Data model layers in IEC 61850
The levels of this hierarchy can be described as follows:
Physical Device – Identifies the actual IED within a system. Typically
the device’s name or IP address can be used (for
example Feeder_1 or 10.0.0.2).
Logical Device – Identifies groups of related Logical Nodes within
the Physical Device. For the MiCOM relays, 5
Logical Devices exist: Control, Measurements,
Protection, Records, System.
Wrapper/Logical Node Instance – Identifies the major functional areas within the
IEC 61850 data model. Either 3 or 6
characters are used as a prefix to define the
functional group (wrapper) while the actual
functionality is identified by a 4 character
Logical Node name suffixed by an instance
number. For example, XCBR1 (circuit
breaker),MMXU1 (measurements), FrqPTOF2
(overfrequency protection, stage 2).
SC
Data Object – This next layer is used to identify the type of
data you will be presented with. For example,
Pos (position) of Logical Node type XCBR.
Data Attribute – This is the actual data (measurement value,
status, description, etc.). For example, stVal
(status value) indicating actual position of
circuit breaker for Data Object type Pos of
Logical Node type XCBR.
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