21.4 LON communication protocol
IP14420-1 v1
21.4.1 Application
IP14863-1 v1
M14804-3 v6
Control Center
IED IEDIED
Gateway
Star coupler
RER 111
Station HSI
MicroSCADA
IEC05000663-1-en.vsd
IEC05000663 V2 EN-US
Figure 417: 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 fiber optic LON bus is implemented using either glass core or plastic core fiber
optic cables.
Table 60: Specification of the fiber optic connectors
Glass fiber Plastic fiber
Cable connector ST-connector snap-in connector
Cable diameter 62.5/125 m 1 mm
Max. cable length 1000 m 10 m
Wavelength 820-900 nm 660 nm
Transmitted power -13 dBm (HFBR-1414) -13 dBm (HFBR-1521)
Receiver sensitivity -24 dBm (HFBR-2412) -20 dBm (HFBR-2521)
Section 21 1MRK 506 369-UEN B
Station communication
828 Line distance protection REL670 2.2 IEC
Application manual
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