APPLICATION GUIDE FOR
FRONIUS TAURO DATA COMMUNICATION
Correct configuration of data communication for the Fronius Tauro
© Fronius International GmbH
Version V1.0 May/2021 Peter Schmidhuber, Jasmin Gross
Solar Energy
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of Fronius. You are hereby reminded that the information published in this document, despite the greatest care being exercised in its
preparation, is subject to change and that neither the author nor Fronius can accept any legal liability. Gender-specific wording refers
equally to the male and female form
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TABLE OF CONTENT
1 Introduction ..................................................................................................................................... 4
2 Difference to SnapINverter series ................................................................................................. 5
3 Independent datcom cabling ......................................................................................................... 5
4 Positioning of LAN switches ......................................................................................................... 6
4.1 Example 1: All inverters in one direction .......................................................................................... 6
4.2 Example 2: Inverters positioned irregularly ...................................................................................... 7
4.3 Example 3: Precombined variant ...................................................................................................... 8
5 LAN switch types and setup .......................................................................................................... 9
5.1 Standard Ethernet switch .................................................................................................................. 9
5.2 PoE switch ........................................................................................................................................ 9
5.3 Outdoor switch without PoE ............................................................................................................ 11
5.3.1 Supplied by 12 V output .................................................................................................................. 11
5.3.2 Supplied by AC area ....................................................................................................................... 11
5.3.3 Supplied from AC area (incl. power adaptor) ................................................................................. 12
5.4 Outdoor PoE switch ........................................................................................................................ 12
5.5 Built-in switch inside the Tauro ....................................................................................................... 13
5.6 Real life example – Tauro pre-series in Austria .............................................................................. 14
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1 INTRODUCTION
This guide will provide assistance on the correct data communication cabling for Fronius Tauro devices. A
stable data connection forms the basis for efficient monitoring and sustainable operation of the entire PV
system.
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2 DIFFERENCE TO SNAPINVERTER SERIES
With the earlier Fronius SnapINverter generation, data communication was carried out via a so-called
Solar.Net ring. The LAN communication was established from inverter to inverter (up to 10 inverters) and
resulted in lower star cabling costs. In the event of a data communication error on one device, all other
devices in the same ring could also lose data communication.
3 INDEPENDENT DATCOM CABLING
Fronius Tauro devices are no longer connected in a Solar.Net ring for data communication cabling. The
cabling is installed independently and individually in a star network. This results in more reliable
communication due to a more robust cabling layout.
Star LAN layout for reliable data communication:
Easy to plan
Robust in case of failure
Easy and fast troubleshooting
100 m distance allowed (LAN standard)
Switches as signal amplifiers used
PoE switch / outdoor switches
Picture 1: Individual LAN connection of Fronius Tauro
If more than 100 m of single cable length is necessary, a LAN switch has to be used to amplify the signal
quality.
The following example situations are intended to give an impression of the simple use of LAN switches to
ensure efficient data communication.
If a plant controller is needed, it can be easily integrated into the inverter communication network. Plant
controllers are usually installed on the communication board. Current and voltage are measured on the main
switchboard, depending on local regulations.
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