SIGMATEK VARAN SV 142 S-DIAS, Техническое руководство

Страница: 24 / 36

SV 142 S-DIAS SPLITTER VARAN
Page 22 02.08.2019
10 Recommended Shielding for VARAN
The VARAN real-time Ethernet bus system exhibits a very robust quality in harsh industrial
environments. Using IEEE 802.3 standard Ethernet physics, the potentials between an
Ethernet line and sending/receiving components are separated. In the event of an error, the
VARAN Manager resends messages to a bus participant immediately. The shielding
described below is mainly recommended.
For applications in which the bus is operated outside the control cabinet, the correct shielding
is required. This is especially important, if due to physical requirements, the bus cables must
be placed next to sources of strong electromagnetic noise. It is recommended to avoid placing
VARAN bus lines parallel to power cables whenever possible.
SIGMATEK recommends the use of CAT5e industrial Ethernet bus cables.
An S-FTP cable should be used for the shielding.
An S-FTP bus is a symmetric, multi-wire cable with unshielded pairs. For the entire shielding,
a combination of foil and braiding is used. A non-laminated variant is recommended.
The VARAN cable must be secured at a maximum distance of 20 cm from
the connector to protect against vibration!