MDP 101-1
Page 76 05.06.2020
8 VARAN Recommended Shielding
The VARAN real-time Ethernet bus system offers robust performance in harsh industrial
environments. Through the use of IEEE 802.3 standard Ethernet physics, the potential
between an Ethernet line and sending/receiving components is kept separate. The VARAN
Manager resends messages to a bus participant immediately when an error occurs. It is
principally recommended that the shielding guidelines below be followed.
For applications in which the bus line is run outside the control cabinet, correct shielding is
required. This is especially important, if due to physical requirements, the bus lines must be
placed next to sources of strong electromagnetic noise. It is recommended that whenever
possible, to avoid wiring VARAN-Bus lines parallel to power cables.
SIGMATEK recommends the use of CAT5e industrial Ethernet bus lines.
For the shielding variants, an S-FTP bus line is recommended, which is a symmetric, multi-
wire cable with unshielded pairs. For the total shielding, a combination of foil and braiding is
used; it is recommended that an unvarnished variant be used.
The VARAN cable must be secured at a distance of 20 cm from the connector for
protection against vibration!
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