Siemens SIMATIC S5 Manual page 275

Reaction times in the ET 200 distributed I/O system
C.3 Reaction time t
Definition
Importance
C-8
DP
t is the reaction time on the SINEC L2 DP bus between master and slave.
DP
Figure C-5 Reaction time t
t depends on the following factors:
DP
Table C-6 Factors influencing reaction time t
Factor
Baud rate
Number of DP slaves
t
DP
DP
DP
Reaction time t
High baud rate, e.g. > 500 kbaud
Few DP slaves assigned to a master
t
DP
is low:
DP
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a