Siemens SIMATIC S5 Manual page 283
Distributed i/o system
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Reaction times in the ET 200 distributed I/O system
Calculating t
I/Obus
Calculating t
I/O
Final calculation
C-16
t
is the duration of the transfer between the IM 318 and the I/O modules
I/Obus
via the I/O bus.
Table C-11 Constants for calculating t
Reaction time constant (ms)
ET 200U
ET 200U
(Siemens DP)
(standard DP)
0.151
Calculate t
by inserting the values from the table above:
I/Obus
Reaction time constant
0
(Number of analog modules,
CPs, IPs)
2
("Number of bytes inserted")
0
(Number of empty slots)
The manual ET 200U Distributed I/O Station provides us with an average
figure of 5 ms:
t
= 5 ms
I/O
The figures already obtained can now be used to calculate t
ET 200U:
t
= t
+ t
slave, ET 200U
IM 318
t
= 5.36 ms
slave, ET 200U
for ET 200U
I/Obus
Constant ("bytes inserted") (ms)
ET 200U
(Siemens DP)
0.251
0.089
0.014 ms
(constant)
0.089 ms
("bytes inserted"
constant)
0.039 ms
(constant)
t
I/Obus
+ t
= 0.03 ms + 0.33 ms + 5 ms
I/Obus
I/O
ET 200U
(standard DP)
0.120
=
0.151 ms
+
=
0.0 ms
+
=
0.178 ms
+
=
0.0 ms
=
0.33 ms
for the
slave
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
- Quick Links:
- IM 308-C Master Interface
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