Configuration
4.6 Interface configuration
SIMATIC CC7
60 Operating Instructions, 10/2019, C79000-G8976-C503-02
● Number of masters / Number of slaves
When using the "Standard/DP" and "Universal" profiles, you can specify the number of
masters and slaves in the network in these two input boxes. The number of masters and
slaves is used for calculating the bus parameters in the network.
Permissible value ranges for these profiles:
– Number of masters: 0..126
– Number of slaves: 0..126
If you are using the "User-defined" profile, the two input boxes are disabled. In this case,
the boxes have a fixed presetting:
– Number of masters: 1
– Number of slaves: 126
Bus parameters
The parameters (see table) that describe the properties of the PROFIBUS subnet are mostly
preset:
● The bus parameters are fixed or are calculated from them with the use of the
"Standard/DP" "Universal" profiles.
● If you are using the "User-defined" profile, you can configure some bus parameters.
Note
Configuring the bus parameters
We recommend applying the values already set in the connected PROFIBUS network for the
bus parameters.
Range of values *
(default setting) **
Tslot 815/995...16383 *
(100...3000)
Slot time [t_Bit]
The slot time specifies the maximum length of time the sender will wait for a
response from an addressed partner.
For the calculation, the following parameters which have an effect on the
bus hardware are used as basis:
• Cable length: 1...1100 m
• Number of repeaters: 0...10
Max. Tsdr 76...1023 *
(55...980)
Maximum protocol processing time [t_Bit]
The maximum protocol processing time specifies the maximum time al-
lowed for the responding station to answer.
Max. Tsdr must be less than the slot time.
Min. Tsdr 11...75 *
(11...150)
Minimum protocol processing time [t_Bit]
The minimum protocol processing time specifies the minimum amount of
time after which the responding station can answer.
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