Siemens SIMATIC NET PROFIBUS Instrukcje Operacyjne Pobierz pdf (Strona 52)

Installation and Maintenance

5.10 Configuration

SIMATIC NET PROFIBUS Optical Link Module OLM V4.0

46 Operating Instructions, 01/2013, C79000-G8976-C270-03

The factors a, b and c depends on the transmission speed and can be found in the following

table:

Data rate

a b c

12 Mbps

1651 240 28

6 Mbps

951 120 24

3 Mbps

551 60 24

1.5 Mbps

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

1651 240 28

6 Mbps

951 120 24

3 Mbps

551 60 24

1.5 Mbps

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.

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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