or control functions in the IED. The function outputs are updated once
every second and, therefore, do not reflect the quality bits in real time.
20.4 LON communication protocol
20.4.1 Application
Control Center
IED IEDIED
Gateway
Star coupler
RER 111
Station HSI
MicroSCADA
IEC05000663-1-en.vsd
IEC05000663 V2 EN
Figure 335: Example of LON communication structure for a substation
automation system
An optical network can be used within the substation automation system. This enables
communication with the IEDs through the LON bus from the operator’s workplace,
from the control center and also from other IEDs via bay-to-bay horizontal
communication. For LON communication an SLM card should be ordered for the
IEDs.
The fibre optic LON bus is implemented using either glass core or plastic core fibre
optic cables.
Table 75: Specification of the fibre optic connectors
Glass fibre Plastic fibre
Cable connector ST-connector snap-in connector
Cable diameter 62.5/125 m 1 mm
Max. cable length 1000 m 10 m
Table continues on next page
Section 20 1MRK 502 071-UEN -
Station communication
698 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
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