Technical data

Installing bus cables
C.6 Electromagnetic compatibility of bus cables
PROFIBUS Network Manual
System Manual, Edition 04/2009, C79000-G8976-C124-03
263
Fitting strain relief
Although the BFOC connectors have their own strain relief and kink protection, it is advisable
to arrange for additional strain relief as close as possible to the connected device to protect
against mechanical strain.
Plan adequate attenuation reserves
When installing the cables over long distances, it is advisable to include one or more future
repair splices in the power loss budget.
Electromagnetic immunity
Fiberoptic cables are immune to electromagnetic interference. Installing cables in cable
channels along with other cables (for example 230 V/380 V power supply cables) causes no
problems. When installing in cable channels, however, make sure that the permitted strain
on the fiberoptic cables is not exceeded when pulling in other cables later.
Attaching PROFIBUS fiber-optic cables
The attachment of the various PROFIBUS fiber-optic cables to optical bus components
(OLM, OBT,...) and devices with an integrated optical interface is described in the chapter
"Passive components for optical networks" and in Appendix "
Installation instructions and
notes on usage (Page
277)".
C.6 Electromagnetic compatibility of bus cables
Electromagnetic compatibility (EMC)
Electromagnetic compatibility (EMC) includes all questions of electrical, magnetic and
electromagnetic immunity and emission.
To avoid interference affecting electrical systems, these effects must be reduced to a certain
level. The measures involved in achieving this limitation include the design, construction, and
correct connection of bus cables. The components and bus cables for SIMATIC NET
PROFIBUS meet the requirements of the European standards for devices used in an
industrial environment. This is documented by the CE marking.
Note
The limit values specified can only be guaranteed if the matched components for SIMATIC
NET PROFIBUS are used consistently! The installation instructions in this manual and in the
manuals of the networked programmable logic controllers must also be adhered to exactly!