Siemens SIMATIC NET Operating Instructions Manual page 52

Connection
6.5 Connecting optical cables
4. Close unused BFOC sockets with the supplied protective caps.
– An unused optical channel should be set to the "bus without fiber-optic link monitoring"
– Incident light from the surroundings can cause disturbances on the network
– Dust entering the optical components can make them unusable.
5. Keep to the maximum length of the fiber-optic cables and the possible fiber types, See
"Properties and functions (Page 11)" and "Technical data (Page 73)".
6. Test the quality of the link using the measurement socket after installing the optical
network. The measured values must be in the permitted range as can be found in section
"Optical channels (Page 48)".
Note
No plastic fiber-optic cable may be connected to an OLM that uses glass fiber-optic cable
and vice versa.
Note
The laying of fiber-optic cables requires special measures.
Avoid mechanical stress such as traction, pressure or kinking.
The cable manufacturers specify minimum bending radii for fiber-optic cables both during
installation and operation. The bending radii and the requirements when laying cables
depend largely on the cable type used and must therefore be checked in the instructions in
the relevant data sheets. Ignoring these requirements may lead to higher attenuation values
and, in the worst case (extreme bending etc.), to destruction of the fiber-optic cable.
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mode so that it does not cause a broken fiber-optic cable signal.
particularly, if the surroundings are very bright.
Operating Instructions, 01/2020, C79000-G8976-C270-06
Optical link module