Parameter assignment/addressing
3.6 Bus parameters
PROFIBUS with STEP 7 V13
54
Function Manual, 12/2014, A5E03775446-AC
Bus parameters for the bus profile of PROFIBUS subnets
Note
Display of offline values
The offline values of the bus parameters are always displayed even if they are connected
online with the target system.
Table 3- 2
Bus parameters - value ranges
Bus parameters
Adjustable
1
Limit values
Tslot_Init
Yes
Max. Tsdr + 15 <= Tslot_Init <= 16.383 t_Bit
Max. Tsdr
Yes
35 + 2*Tset + Tqui <= Max. Tsdr <= 1,023 t_Bit
Min. Tsdr
Yes
11 t_Bit <= Min. Tsdr <= MIN(255 t_Bit, ...
... Max. Tsdr - 1, 34 + 2*Tset + Tqui)
Tset
Yes
1 t_bit <= Tset <= 494 t_bit
Tqui
Yes
0 t_bit <= Tqui <= MIN(31 t_bit, Min. Tsdr - 1)
GAP factor
Yes
1 <= GAP factor <= 100
Retry limit
Yes
1 <= Retry limit <= 15
Tslot ( slot time)
No
-
Tid2
No
Tid2 = Max. Tsdr
Trdy
No
Trdy = Min. Tsdr
Tid1
No
Tid1 = 35 + 2*Tset + Tqui
Ttr (Target Rotation Time) Yes
256 t_Bit <= Ttr <= 16,777,960 t_bit
Ttr typical
No
This time is for information only and is not transmitted to
the devices.
Watchdog
10 ms <= Watchdog <= 650 s
1
depending on bus profile
User-defined bus profile
Use the following settings to create a user-defined bus profile:
●
minimum Target Rotation Time (Ttr) = 5000x HSA (highest PROFIBUS address of an
active device)
●
minimum watchdog (Watchdog) = 6250x HSA
Recalculate
Use the button "Recalculate" to recalculate the parameters.
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