54
Installation OZD Profi 12M ...
Release
01
07/2017
5 Configuration
During configuration, the PROFIBUS network parameter "Slot time" must be
adapted to the network coverage, network topology and the data rate due to
frame delays caused by lines and network components, as well as by
monitoring mechanisms in the network components.
Configuration of redundant optical rings
The following configuration conditions must be fulfilled in the redundant
optical ring See “Redundant ring” on page 30.
– (1) Configuration of a non-existent bus subscriber
– (2) Increasing the retry value to at least 3
– (3) Checking and adjusting the slot time
Use the user-specific profile of the configuration tool to set the parameters
under (2) and (3).
Calculate the slot time with the following equation:
Slot time = a + (b × Length
OF
) + (c × Number
OZD
)
Slot time is the monitoring period in bit times.
Length
OF
is the sum of all the optical fiber lines (segment lengths) in
the network.
Number
OZD
is the number of OZD Profi 12M ... in the network.
Data rate a b c
12 Mbit/s
a
a. Use the values from table 9 if the calculated slot time is smaller than the
minimum slot time indicated in the table.
1651 240 28
6Mbit/s
a
951 120 24
3Mbit/s
a
551 60 24
1.5 Mbit/s
a
351 30 24
500 kBit/s 251 10 24
187.5 kBit/s 171 3.75 24
93.75 kBit/s 171 1.875 24
45.45 kBit/s 851 0.909 24
19.2 kBit/s 171 0.384 24
9.6 kBit/s 171 0.192 24
Table 7: Constants for calculating the slot time at DP standard (redundant optical
ring).
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