Technical data

Communication
9.3 Communication via PROFIBUS DP
Function Manual
Function Manual, 06/2012, 6SL3097-4AB10-0BP4
637
Setting criteria for times
● Cycle (T
DP
)
– T
DP
must be set to the same value for all bus nodes.
– T
DP
> T
DX
and T
DP
> T
O
T
DP
is thus large enough to enable communication with all bus nodes.
NOTICE
After T
DP
has been changed on the PROFIBUS master, the drive system must be
switched on (POWER ON) or parameter p0972 = 1 (reset drive unit) must be set.
● T
I
and T
O
– Setting the times in T
I
and T
O
to be as short as possible reduces the dead time in the
position control loop.
– T
O
> T
DX
+ T
Omin
● A tool can be used for settings and optimization (e.g. HW Config in SIMATIC S7).
Minimum times for reserves
Table 9- 38 Minimum times for reserves
Data Time required [µs]
Base load 300
Per slave 20
Per byte of user data 1,5
One additional class 2 master 500