Parameters and properties
30
SIPROTEC PROFIBUS-DP - Communication profile
C53000-L1840-B001-03
Redundancy
function
GlobalSection.DP_OLM_Redundancy
Devices with communication module up to HW revision 3
Enable the Redundancy function (DP_OLM_Redundancy = 1) if a redundant fibre-
optical network configuration is used (Redundant optical ring or Line redundancy with
transmitter-to-receiver links).
The parameter corresponds to DIL switch S2 at the OLM/S4 or OLM/G12 (in compat-
ibility mode).
Devices with communication module from HW revision 4
Set “Redundancy function” together with parameter "Operating mode" (see above).
Netzwork size GlobalSection.DP_OLM_NetworkSize
Depending on the number of moduls (Optical Link Moduls or fibre-optical SIPROTEC
communication moduls) in the PROFIBUS net, the used baud rate and the cable
length either network size “Standard” (DP_OLM_NetworkSize = 0) or “Extended”
(DP_OLM_NetworkSize = 1) is to be selected.
Line and star topology
Always select "Standard" setting.
Ring topology
Calculate settings using Table 2-3:
The parameter corresponds to DIL switch S5 at the OLM/S4 and to DIL switch S3 at
OLM/G12 (in compatibility mode).
The position of the DIL switch S3 at the OLM/G12 has to be set inversely to the value
DP_OLM_NetworkSize, i.e. S3 = 1 for DP_OLM_NetworkSize = 0 and vice versa.
Note:
The value of “Network size” is only relevant if a communication module up to HW revi-
sion 3 or a communication module from HW revision 4 configured for OLM V2 com-
patible mode (see above) is used.
“Network size” is not evaluated if OLM V3 compatible mode is configured.
Baud rate "Standard" "Extended"
9.6 kB/s l + 30 n ≤ 1800 1800 < l + 30 n ≤ 4620
19.2 kB/s l + 15 n ≤ 900 900 < l + 15 n ≤ 2310
93.75 kB/s l + 3.2 n ≤ 191 191 < l + 3.2 n ≤ 491
187.5 kB/s l + 1.6 n ≤ 95 95 < l + 1.6 n ≤ 245
500 kB/s l + 0.6 n ≤ 48 48 < l + 0.6 n ≤ 92
1500 kB/s l + 0.2 n ≤ 22 22 < l + 0.2 n ≤ 30
Table 2-3 Configuration of fibre-optical connection - Selection of network size settings
n = Number of moduls (Optical Link Moduls or fibre-optical SIPROTEC communication
moduls) in the ring
l = Total length of all fibre-optical subsections in km
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