Installation and Maintenance
5.10 Configuration
SIMATIC NET PROFIBUS, Optical Link Module
Operating Instructions, 07/2008, A2B00065774O, Edition V1.5
43
Data rate
a b c
12 Mbps
5
1651 240 28
6 Mbps
1
951 120 24
3 Mbps
1
551 60 24
1.5 Mbps
1
351 30 24
500 Kbps
251 10 24
187.5 Kbps
171 3.75 24
93.75 Kbps
171 1.875 24
45.45 Kbps
851 0,909 24
19.2 Kbps
171 0,384 24
9.6 Kbps
171 0,192 24
Table 5-2 Constants for calculating the slot time
for DP-standard (redundant optical ring)
Data rate
a b c
12 Mbps
1
1651 240 28
6 Mbps
1
951 120 24
3 Mbps
1
551 60 24
1.5 Mbps
1
2011 30 24
500 Kbps
771 10 24
187.5 Kbps
771 3.75 24
93.75 Kbps
451 1.875 24
45.45 Kbps
851 0.909 24
19.2 Kbps
181 0.384 24
9.6 Kbps
171 0.192 24
Table 5-3 Constants for calculating the slot time for
DP/FMS (”universal“) and DP with S5 95U (redundant optical ring)
The slot time calculation only takes into account the optical network and the
connection of bus nodes to the OLM via a RS-485 bus segment each with a
maximum length of 20 m. Longer RS-485 bus segments are included in the
calculation by adding them to the length of the fiber-optic cables.
Note:
If the value of the slot time is configured too low, this can lead to malfunctions and
error messages on the OLM. The system LED flashes red/green.
5
With OLM/G11-1300 and OLM/G12-1300, minimum slot times must be maintained according to the following table at data
rates of 12 Mbps, 6 Mbps, 3 Mbps and 1.5 Mbps:
Data rate Minimum slot time
12 Mbps 3800 t
Bit
6 Mbps 2000 t
Bit
3 Mbps 1000 t
Bit
1.5 Mbps 530 t
Bit
If the calculated slot time is shorter than the minimum slot time, use the minimum slot time from the table above as the
configured slot time.
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