Integration Of Long Fo Cable Runs - Siemens SIMATIC NET OBT Operating Instructions Manual

Network topology

5.2 Integration of long FO cable runs

5.2 Integration of long FO cable runs
The maximum permitted length of PCF FO cable with the OBT is 300 m. If longer FO links or other
FO cable types, for example glass graded index fibers or monomode fibers are necessary, they
can be used by combining OBTs with OLMs (Optical Link Module). In this situation, the OBT is
connected electrically with the OLM (OBT/CH 1 to OLM/CH 1) and the OLM is connected to the
long FO cable link. At the end of the FO cable link, the combination is reversed with a second
OLM/OBT pair.
Figure 5-1 Example of covering longer FO links with OBTs and OLMs
The maximum permitted transmission speed and the type and maximum length of the FO cable
link is decided by the OLM type.
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PROFIBUS Optical Bus Terminal (OBT)
Operating Instructions, 06/2022, C79000-G8976-C122-08