Siemens SIMATIC NET PROFIBUS - Manual (Page 407)

3.1 Line topology
11
3 Network Topologies
Version 1.0 8/00
3.1.2 Line topology without optical fiber link monitoring
Use this operating mode if you connect a PROFIBUS OLM with another optical fiber network component, which does
not send a frame echo and does not expect or is not compatible with a frame echo in accordance with PROFIBUS
guidelines (optical/electrical converter).
Ⅲ
Monitoring mechanisms:
Send echo:
no
Monitor echo: no
Suppress echo: no
Monitor: no
Segmentation: no
Individual fiber links are not monitored in this operating mode.