Control Center
IED IEDIED
Gateway
Star coupler
RER 111
Station HSI
MicroSCADA
IEC05000663-1-en.vsd
IEC05000663 V2 EN
Figure 50: 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 in the 670 series through the LON bus from
the operator’s workplace, from the control center and also from other IEDs via bay-
to-bay horizontal communication.
The fibre optic LON bus is implemented using either glass core or plastic core fibre
optic cables.
Table 13: 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
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)
10.2.1 The LON Protocol
The LON protocol is specified in the LonTalkProtocol Specification Version 3
from Echelon Corporation. This protocol is designed for communication in control
networks and is a peer-to-peer protocol where all the devices connected to the
network
can communicate with each other directly. For more information of the bay-
to-bay communication, refer to the section Multiple command function.
Section 10 1MRK 504 088-UEN C
Establishing connection and verifying the LON communication
94
Installation and commissioning manual
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