Siemens SIMATIC S5 Manual page 282

C.5.3 Calculating t
Calculating t The configuration includes three different slaves:
slave
Let us calculate t
three different reaction times, namely t
Calculating t
t
IM 318 IM 318
Table C-10 Basic values at different baud rates for calculating the reaction time t
9.6 kbaud
19.2 kbaud
93.75 kbaud
187.5 kbaud
500.0 kbaud
1.5 Mbaud (0 output byte)
Insert the values from Table C-10 to calculate t
1
(Number of output bytes)
1
(Number of input bytes)
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
Reaction times in the ET 200 distributed I/O system
slave
Slave
ET 200B
ET 200C
ET 200U
for the ET 200U. t
slave
is the reaction time in the ET 200U caused by a data telegram.
of the ET 200U
Baud rate
1.5 Mbaud (1 output byte)
1.5 Mbaud (2 output bytes)
1.5 Mbaud (> 2 output bytes)
t
slave
0 ms
0 ms
t + t
IM 318 I/Obus
for the ET 200U is the sum of
slave
, t and t :
IM 318 I/Obus I/O
Basic value T (ms)
byteO
(ms)
2.3 1.16
1.18 0.58
0.273 0.122
0.154 0.063
0.081 0.026
0.0594 0.0
0.069 0.0
0.073 0.0
0.043 0.011
:
IM 318
Basic value = 0.081 ms
+
0.026 ms = 0.026 ms
(T ) +
byteO
0.0036 ms = 0.0036 ms
(T ) =
byteI
t 0.03 ms
IM 318
+ t
I/O
IM 318
T (ms)
byteI
0.0036
0.0036
0.0036
0.0036
0.0036
0.0036
0.0036
0.0036
0.0036
C-15
C