Festo 174335, Electronic Manual

Page: 65 / 184

3. Installation
3-29
Festo P.BE-VIFB13-03-EN en 0003c
3.4.3 Connection for fibre optic cable (FOC)
The following types of cables can be used for transmission
with the PROFIBUS:
– Cable bound transmission
(screened two-wire cable)
– Fibre optic cable (plastic and fibre glass)
Optical fibre waveguide technology is to be recommended
where there is heavy interference, as well as for extending the
transmission range when high baud rates are used.
This also offers the following advantages:
– higher EMC, ESD protection due to the optical trans-
mission of signals
– protection against lightning
– potential isolation of the individual DP slaves (equalizing
currents cannot flow through a cable screening)
The PROFIBUS-DP interface of the node has been designed in
accordance with specification EN 50170 Volume 2, and can
therefore be used for controlling network components for
optical fibre waveguides.
Example for optical fibre waveguide network components:
– Siemens Optical Link Module (OLM) for PROFIBUS plus
– Siemens Optical Link Module (OLM) for PROFIBUS