Optical Budget Calculation For Serial Communication With Lon - ABB RES670 2.1 Commissioning Manual

1MRK 511 366-UUS -
7.2
Commissioning manual
Establishing connection and verifying the LON communication
The HV Control 670 software module and 670 series Object Type files are
used with both 650 and 670 series IEDs.
Use the LON Network Tool (LNT) to set the LON communication. This is a software tool
applied as one node on the LON bus. To communicate via LON, the IEDs need to know
• 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.
Optical budget calculation for serial communication with
LON
Table 11: Example
Maximum attenuation
4 dB/km multi mode: 820 nm - 62.5/125 um
0.3 dB/m plastic: 620 nm - 1mm
Margins for installation, aging, and so on
Losses in connection box, two contacts (0.75 dB/contact)
Losses in connection box, two contacts (1dB/contact)
Margin for repair splices (0.5 dB/splice)
Maximum total attenuation
Section 7
Distance 1 km Distance10 m
Glass Plastic
-11 dB - 7 dB
4 dB -
- 3 dB
5 dB 2 dB
1.5 dB -
- 2 dB
0.5 dB -
11 dB 7 dB
61