Fibre optic network limits Section 2 Transmission Technology
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Fibre optic network limits
Fibre Optic transmission technology is mainly used to expand the existing RS485
technology over its distance limits and to prevent communication errors in EMC
areas. However fibre optics are as well as RS485 limited in the distance and the
transmission speed, depending on the used hardware and the cable type.
Between the DP/fibre optic converter are no PROFIBUS slaves connected.
Fibre cable types and its maximum distance are already described in Table 6.
PROFIBUS DP slaves are always connected to the RS485 network. Fibre optic
transmission technology has to be converted in RS485 technology before, if DP
slaves shall be connected.
There are several RS485/fibre optic converter available from different
manufacturer. ABB recommends RS485/fibre optic converter from Hirschmann
(OZD Profi 12M) and Phoenix Contact (PSI-MOS-PROFIB/FO). Optical link
modules described in this document are based on the Hirschmann RS485/fibre
optic converter. However, the components from Phoenix Contact are working in
the same way as Hirschmann RS485/fibre optic converter.
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