Siemens SIMATIC S5-95F - Response Time and Minimum Signal Duration for Time-Controlled Program Processing

S5-95F Rules for Failsafe Operation of an 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.
Figure 18-3. Response Time for a Time-Controlled Program Scan
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Delay for the DI module
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Execution
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Execution
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Variable delay time
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Variable delay time
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Call interval for OB13
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T
OB13
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Call interval for OB13
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Input changes its
signal state, change is
not detected
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Input signal
change is
detected
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Response to input
signal change with
direct access
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
OB13
• 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
1×OB13 call interval
+ OB13 scan delay (max. one OB13 call interval)
+ OB13 execution time, plus 1 data cycle when the S5-95F is configured with
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)
+ 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 18-23