• The node addresses of the other connected IEDs.
• The network variable selectors to be used.
This is organized by LNT.
The node address is transferred to LNT via the local HMI by setting the parameter
ServicePinMsg = Yes. The node address is sent to LNT via the LON bus, or LNT
can scan the network for new nodes.
The communication speed of the LON bus is set to the default of 1.25 Mbit/s. This
can be changed by LNT.
7.2 Optical budget calculation for serial communication
with LON
M11737-4 v2
Table 14: Example
Distance 1 km
Glass
Distance10 m
Plastic
Maximum attenuation -11 dB - 7 dB
4 dB/km multi mode: 820 nm - 62.5/125 um 4 dB -
0.3 dB/m plastic: 620 nm - 1mm - 3 dB
Margins for installation, aging, and so on 5 dB 2 dB
Losses in connection box, two contacts (0.75 dB/contact) 1.5 dB -
Losses in connection box, two contacts (1dB/contact) - 2 dB
Margin for repair splices (0.5 dB/splice) 0.5 dB -
Maximum total attenuation 11 dB 7 dB
1MRK 506 377-UEN C Section 7
Establishing connection and verifying the LON communication
Railway application RER670 2.2 IEC 55
Commissioning manual
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