C.2 Reaction Times With S5-95U As Dp Master - Siemens SIMATIC S5 Manual

C.2 Reaction times with S5-95U as DP master

Reaction times in Fig. C-1 shows the reaction times of the ET 200 distributed I/O system. The
ET 200 aggregate reaction time is the mean reaction time which elapses between the
switching of an input and the associated switching of an output:
Figure C-3 Reaction times in the ET 200 distributed I/O system (S5-95U)
Importance
Table C-1 shows the relative importance of the reaction times introduced in
the above illustration. The individual reaction times are described in detail
below.
Table C-4
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
Reaction times in the ET 200 distributed I/O system
t
slave
t
DP
Importance of reaction times in the ET 200 distributed I/O system
(S5-95U)
Ser. Reaction time
No.
1 ... of application program
in the CPU
2 ... between control proces-
sor and communication
processor in the S5-95U
3 ... on the SINEC L2-DP
bus
4 ... within the slave
t + t
prog inter
t
DP
Ab- Importance
brevi-
ation
Important for access to pro-
t
prog
cess image, otherwise negli-
gible
Occurs in every DP data
t
inter
transfer between the proces-
sors in the S5-95U
Important if bus configura-
t
DP
tion is large, baud rate is low
and/or data telegrams are
extensive
ET 200U, S5-95U: very im-
t
slave
portant
ET 200B, ET 200C: less im-
portant
t
slave
C-5
C