The mandatory data objects as defined in IEC 61850-7-4 as part of the Common
Logical Node are Mode, Behavior, Health and NamePlate. Mod, Health and
NamePlate are mandatory only in the root LLN0, and optional in all other LNs.
Mode
Only On and Off are supported on all LNs except for LD0/LLN0, where On,
Blocked, Test, and Test-Blocked are supported. Beh can then get all the possible
values (On, Blocked, Test, Test-blocked and Off) as a result of Mod on the Root
LLN0 and the individual LNs.
The operation modes ON (enabled) and BLOCKED are supported remotely by a
command or locally from the LHMI of the IED.
If the setting “RemoteModControl” is set to “Off” (default), all
remote writes to Mod will be rejected.
Behaviour
The operational mode as given by the Mode control is shown in the data object Beh
according to priority rules described for Beh in clause 6 of IEC 61850-7-4.
The Beh shows the actual state of the function depending on the hierarchy
described in clause 6 of IEC 61850-7-4.
It is possible that the behavior is influenced also by other sources independent from
the Mod, for example Insertion of the test handle, loss of SV, IED configuration
tool (PCM600), or LHMI.
In case the setting “operation” of a function is set to Off from the LHMI or
PCM600, the Beh will be set to Off independent of the value of the Mod.
The state Off can be set from the LHMI or the PCM600 for the functions having
the setting “operation”.
The TEST and the TEST/BLOCKED mode can be operated locally from the LHMI
or by using PCM600.
Health
Health will reflect the current status of the IED HW and configuration. Possible
values are: OK, Warning, and Alarm.
Health indicates OK, Warning, or Alarm, depending on the IED status.
NamePlt
The name of the logical node and its relation to namespace definition are shown in
the data object NamePlt as specified for the SCL structure.
Section 7
1MRK 511 393-UEN A
Logical node data model
46
670 series 2.2 IEC
Communication protocol manual
