ABB RELION RET670, Commissioning Manual, Page: 71 / 328

Section 7 Establishing connection and verifying the
LON communication
7.1 Communication via the rear ports
7.1.1 LON communication
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.
Control Center
IED IED IED
Gateway
Star coupler
RER 111
Station HSI
MicroSCADA
IEC05000663-1-en.vsd
IEC05000663 V2 EN
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
1MRK 504 165-UUS -
Section 7
Establishing connection and verifying the LON communication
Transformer protection RET670 2.2 ANSI 65
Commissioning manual