Siemens SIMATIC NET Operating Instructions Manual page 66

Planning/configuring
7.2 Configuration
You will find the factors a, b and c in the following tables:
Data rate
12 Mbps
6 Mbps
3 Mbps
1.5 Mbps
500 kbps
187.5 kbps
93.75 kbps
45.45 kbps
19.2 kbps
9.6 kbps
Constants for calculating the slot time with the DP standard (redundant optical ring)
Data rate
12 Mbps
6 Mbps
3 Mbps
1.5 Mbps
500 kbps
187.5 kbps
93.75 kbps
45.45 kbps
19.2 kbps
9.6 kbps
Constants for calculating the slot time with DP/FMS ("Universal") and DP with S5-95U (redundant
optical ring)
Minimum slot times for OLM / G11-1300 and OLM / G12-1300
With OLM / G11-1300 and OLM / G12-1300, the minimum slot times must be kept to as
shown in the following table at data rates of 12 Mbps, 6 Mbps, 3 Mbps and 1.5 Mbps:
Data rate
12 Mbps
6 Mbps
3 Mbps
1.5 Mbps
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.
66
a
1651
951
551
351
251
171
171
851
171
171
a
1651
951
551
2011
771
771
451
851
181
171
Operating Instructions, 01/2020, C79000-G8976-C270-06
b
240
120
60
30
10
3.75
1.875
0.909
0.384
0.192
b
240
120
60
30
10
3.75
1.875
0.909
0.384
0.192
Minimum slot time
3800 t
Bit
2,000 t
Bit
1,000 t
Bit
530 t
Bit
c
28
24
24
24
24
24
24
24
24
24
c
28
24
24
24
24
24
24
24
24
24
Optical link module