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Rules Governing the Use of the S5-115F
10.3.3 Response Time in the Case of Direct Access in the Time Interrupt OB
(OB 13)
If the inputs are read in and the outputs are activated by direct access in the time interrupt OB, the
following applies for the response time:
T
T
+T
+T
R
OB 13
synchr.
proc.
Input signal
Synchr.
e.g.
time
every
inter-
100
rupt
msec.
OS
OS
after
bef.
user
user
prog.
prog.
.
Figure 10-3. Response Time in the Case of Direct Access in Time Interrupt OB 13
Explanation of Figure 10-3
If input signal
changes after the relevant direct access
recognized in the next possible OB 13 call. It is possible in the following cases:
•
When the interval time for OB 13 has elapsed (250 msec. in the example)
•
When the next synchronization point
20 msec. in general).
10.3.4 Response Time in the Case of Direct Access in the Process Interrupt OB
(OB 2)
If the inputs are connected to a module with interrupt capability and the outputs are directly
accessed in the process interrupt OB, the following applies for the response time to a falling edge
at the input:
TR T
+T
+ T
synchr.
proc.
OS
10-4
Read-in with LPW
Time interrupt, e.g. every
250 msec.
LPW
OB 13
OB 13
TPW
T proc.
Output response
OB 13
in OB 13, the change will be
has been reached (100 msec. in the example or
S5-115F Manual
OB 13
EWA 4NEB 811 6148-02
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