Siemens SIMATIC S5 Manual page 291
Distributed i/o system
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Reaction times in the ET 200 distributed I/O system
Contribution of
token passing to
t
R
C-24
In a multimaster configuration, the reaction time is prolonged by
t
= t
+ t
R(token)
R(master 1)
R(master 2)
t
Reaction time of DP master 1
R master 1
t
Reaction time of DP master 2
R master 2
t
Reaction time of DP master having the highest station
R master n
number
t
Reaction time for the entire ET 200 distributed I/O system
R(token)
Note: The upper limit for t
Windows. t
in COM ET 200 Windows
The reaction time t
is calculated in a worked example in Section C.5.4. Bear
R
in mind that the reaction time of a master does not include the reaction time
of its slaves. The only components which make up the reaction time of the
master are t
, t
and t
DP
cons
prog
+ ... + t
R(master n)
is set by COM ET 200
R(token)
corresponds to the target rotation time T
R(token)
.
where:
tr
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
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