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S5-95F
18.12.2 Response Time and Minimum Signal Duration for Time-Controlled
Program Processing
If a change in an input signal results in a change in an output signal, the S5-95F's response time is
defined as the instant at which the signal changes at the S5-95F's input terminals until the instant at
which the signal changes at the S5-95F's output terminals.
Delay for the DI module
Execution
of OB13
Call interval for OB13
Input changes its
signal state, change is
not detected
Figure 18-3. Response Time for a Time-Controlled Program Scan
The maximum response time for a time-controlled program scan depends on:
•
the specified OB13 call interval
•
delay time t (see section 7.4.3)
•
OB13's scan time T
•
the input module's delay time
•
the data cycle (if external I/O modules are used)
Under worst-case conditions, the following applies for the response time in a time-controlled program
scan:
T
OB13 response
+ OB13 scan delay (max. one OB13 call interval)
+ OB13 execution time, plus 1 data cycle when the S5-95F is configured with
+ Delay time for the input module
For additional information, please refer to sections 7.4.4 and 7.4.5.
Minimum Signal Duration During Execution of OB13
Note
In a time-controlled program scan (OB13), the S5-95F detects a signal change under
worst-case conditions only when signal levels "0" and "1" are present for at least one
OB13 call interval .
EWA 4NEB 812 6210-02
Variable delay time
Input signal
change is
detected
OB13
1×OB13 call interval
external I/Os and 1 data cycle when a direct access operation to external
I/Os is programmed in OB13 (max. one OB13 call interval)
Rules for Failsafe Operation of an S5-95F
Variable delay time
Execution
of OB13
t
T
OB13
Call interval for OB13
Response to input
signal change with
direct access
t
18-23
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