Electro Industries Shark 200 Installation & Operation Manual page 326

• A Logical Device contains LLN0 and LPHD1 and optional other Logical Nodes.
• LLN0 (Logical Node Zero) is a special object which "controls" the Logical Device. It
contains all of the datasets used for unsolicited transmission from the device. It
also contains the report, SV, and GOOSE control blocks (which reference the data-
sets).
• LPHD1 (Physical Device) represents the hardware "box" and contains nameplate
information.
• Logical Nodes (LNs) are standardized groups of "Data Objects" (DOs). The grouping
is used to assemble complex functions from small groups of objects (think of them
as building blocks). The standard defines specific mandatory and optional DOs for
each LN. The device may instantiate multiple LNs of the same type differentiated by
either a (named) prefix or (numerical) suffix.
• Data Objects represent "real-world" information, possibly grouped by electrical
object. The IEC 61850 standard has specific semantics for each of the DOs. For
example, the DO named "PhV" represents the voltage of a point on a three-phase
power system. The DOs are composed of standardized Common Data Classes
(CDCs) which are groups of low-level attributes of the objects. For example, the DO
named "Hz" represents system frequency and is of CDC named "MV" (Measurement
Value).
• Common Data Classes (CDCs) consists of standardized groups of "attributes" (sim-
ple data types). For example, the attribute "instMag" represents the instantaneous
magnitude of the underlying quantity. The standard specifies mandatory and
optional attributes for each CDC. For example, the DO named "Hz" in Logical Node
class MMXU contains a mandatory attribute named "mag" which represents the
deadbanded value of the frequency. The physical device contains a database of
data values which map to the various structures described above. The database
values are manipulated by the device to perform actions such as deadbanding
(holding a constant value until the underlying value changes by more than a speci-
fied amount) or triggering of reports.
Electro Industries/GaugeTech
Electro Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
The Leader In Power Monitoring and Smart Grid Solutions
E: Using the IEC61850 Network Card
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Doc E149701 E-6