Technical data
87
SIPROTEC PROFIBUS-DP - Communication profile
C53000-L1840-B001-03
Example Redundant optical ring with nine SIPROTEC devices (with optical communication mo-
dules) and one OLM/G12 for the connection of the PROFIBUS-DP master.
Bild 5-1 PROFIBUS parameterization - Number of OLM
Note:
The PSO module is configured to communicate in a redundant optical ring (two fibre
ring) in OLM V2 mode by default.
For an OLM/S4 or OLM/G12 (in compatibility mode) used within such a ring topology
this corresponds to the following DIL switch settings:
OLM/S4
• S1 (Mode) = 0,
• S2 (Redundancy) = 1 and
• S5 (Opt. Power/Dist.) = 0
OLM/G12 (in compatibility mode, S7 = 1)
• S1 (Mode) = 0,
• S2 (Redundancy) = 1 and
• S3 (Distance) = 1
Please note for parameterization of a PROFIBUS-DP communication with re-
dundant optical ring topology:
• every optical SIPROTEC communication module (PSO module) contains an OLM,
• the parameters “Retry limit” and “Slot time (t
slot
)” have to be set to correct values in
the PROFIBUS-DP master.
− Set “Retry limit” at least equal to 3.
− You get the correct value for “Slot time” if you enter for “Number of OLM” in the
Network settings in the parameterization system of the PROFIBUS-DP master
the number of OLM/S4 or OLM/G12 devices plus the number of connected opti-
cal communication modules of the SIPROTEC devices.
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