Hitachi RED670 - Establishing Connection and Verifying the LON Communication; Communication Via the Rear Ports; LON Communication

Section 7 Establishing connection and
verifying the LON communication
7.1 Communication via the rear ports
M12196-2 v1
7.1.1 LON communication
M12196-4 v6
LON communication is normally used in substation automation systems. Optical fiber is used within
the substation as the physical communication link.
The test can only be carried out when the whole communication system is installed. Thus, the test is
a system test and is not dealt with here.
M14804-3 v6
Control Center
IED IEDIED
Gateway
Star coupler
RER 111
Station HSI
MicroSCADA
IEC05000663-1-en.vsd
IEC05000663 V2 EN-US
Figure 8: 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 15: 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
Table continues on next page
1MRK 505 378-UEN Rev. K Section 7
Establishing connection and verifying the LON communication
Line differential protection RED670 61
Commissioning manual
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