Installation OZD Profi 12M ...
Release
01
07/2017
55
The calculation of the slot time only takes into consideration the optical
network and the connection of bus subscribers to the OZD Profi 12M ...
via an RS 485 bus segment with a respective length of max. 20 m. Longer
RS 485 bus segments must be allowed for by adding them to the
Length
OF
.
Note: When the slot time is configured with a too small value the OZD
Profi 12M ... will, through it’s fault function and fault indications, indicate
such. The System-LED will blink red/green.
Note: Using the OZD Profi 12M G11-1300 and … G12-1300 (EEC) at
data rates of 12 MBit/s, 6 MBit/s, 3 MBit/s and 1.5 MBit/s the minimum slot
times according to the following table must be met.
See table 9 on page 55.
Data rate a b c
12 Mbit/s
a
1651 240 28
6 Mbit/s
a
951 120 24
3 Mbit/s
a
551 60 24
1.5 Mbit/s
a
2011 30 24
500 kBit/s 771 10 24
187.5 kBit/s 771 3.75 24
93.75 kBit/s 451 1.875 24
45.45 kBit/s 851 0.909 24
19.2 kBit/s 181 0.384 24
9.6 kBit/s 171 0.192 24
Table 8: Constants for calculating the slot time at DP/FMS (”universal“) and DP
with S595U (redundant optical ring)
Data rate Minimum slot time
12 MBit/s 3800 t
Bit
6 MBit/s 2000 t
Bit
3 MBit/s 1000 t
Bit
1.5 MBit/s 530 t
Bit
Table 9: Minimum slot time on OZD Profi 12M G11-1300 and OZD Profi 12M G12-
1300 (EEC)
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