Technical data

Network configuration

3.3 Frame transmission time

PROFIBUS Network Manual

64 System Manual, Edition 04/2009, C79000-G8976-C124-03

Transmission

speed

a b c

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 3- 11 Constants for calculating the slot time with DP/FMS ("Universal") and DP with S5-95U

(redundant optical ring)

Transmission

speed

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

Note

The slot time calculation takes into account only the optical network and the attachment of

nodes to the OLM in each case via a maximum 20 m long RS485 bus segment. Longer RS-

485 bus segments must be included by adding them to the length of FOC.

With the OLM/G111300 and OLM/G121300, the minimum slot times shown in the following

table must be maintained at transmission speeds of 12 Mbps, 6 Mbps, 3 Mbps and

1.5 Mbps.

Table 3- 12 Minimum slot time for OLM/G111300 and OLM/G121300

Transmission speed Minimum slot time

12 Mbps 3800 t

Bit

6 Mbps 2000 t

Bit

3 Mbps 1000 t

Bit

1.5 Mbps 530 t

Bit