Iec 61850 In Micom Ieds; Figure 55: Data Model Layers In Iec61850 - GE MiCOM P747 Agile Technical Manual

Chapter 7 - SCADA Communications
V01008
Figure 55: Data model layers in IEC 61850
The levels of this hierarchy can be described as follows:
Data Frame format
Layer
Physical Device
Logical Device
Wrapper/Logical Node Instance
Data Object
Data Attribute
10.4

IEC 61850 IN MICOM IEDS

IEC 61850 is implemented by use of a separate Ethernet card. This Ethernet card manages the majority of
the IEC 61850 implementation and data transfer to avoid any impact on the performance of the protection
functions.
To communicate with an IEC 61850 IED on Ethernet, it is necessary only to know its IP address. This can
then be configured into either:
● An IEC 61850 client (or master), for example a bay computer (MiCOM C264)
● An HMI
● An MMS browser, with which the full data model can be retrieved from the IED, without any prior
knowledge of the IED
224
stVal q
Pos
LN1: XCBR
Logical Device : IEDs 1 to n
Physical Device (network address)
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
Identifies groups of related Logical Nodes within the Physical Device. For the MiCOM IEDs, 5 Logical
Devices exist: Control, Measurements, Protection, Records, System
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).
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
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
Data Attributes
t PhA
Data Objects
Logical Nodes : 1 to n
LN2: MMXU
Description
PhB PhC
A
P747-TM-EN-1.1
MiCOM P747
P747-TM-EN-1