S-DIAS CPU UNIT
CP 733
06.12.2019
Page 29
13 Recommended Shielding
The VARAN real-time Ethernet bus system exhibits a very robust quality in harsh industrial
environments. In the event of an error, the VARAN Manager resends messages to a bus
participant immediately.
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 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 shielded data cable must be secured at a maximum distance of 20 cm
from the connector to protect against vibration!
