ETV 1591-H
CONTROL PANEL
Page 52
24.03.2015
12 Recommended Shielding for VARAN
The VARAN real-time Ethernet bus system exhibits a very robust quality in harsh industrial
environments. Through the use of 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 shield-
ing 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 shield-
ing, 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 con-
nector to
protect against vibration!