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Interrupt Processing
12.4
Interrupt Response Times for the S5-95F
The interrupt response time is the time between an edge change at the terminals of an interrupt
input and the appropriate signal change at the terminals of an output on the basic unit. Any delays
attributable to the cables, sensors or actuators are not part of the interrupt response time.
The following section covers response times under worst-case conditions.
Interrupt Response Time for OB2 Interrupts
The interrupt response time for OB2 interrupts, i.e. T
•
The S5-95F's internal delay for OB2 interrupts (max. 5.6 ms, typ. 3 ms)
•
The execution time T
In the majority of applications, the programs in OB2 are relatively short and the execution time of
OB2 is less than 0.2 ms. You can expect a typical interrupt response time of 3.2 ms for OB2
interrupts.
If the execution time of OB2 for your application differs from that assumed above, you can calculate
the interrupt response time using the following formulae.
Typical Interrupt Response Time for OB2 Interrupts
If you have not disabled an interrupt (IA/RA operations) in the user program, the typical
interrupt response time is calculated as follows:
T
OB2 response, typical
If you disable an interrupt in the user program, the interrupt response time will be extended by
the execution time of the program sequence for which the interrupt is disabled (max. 5 ms).
Interrupt Response Time for OB2 Interrupts under Worst-Case Conditions
If you have not disabled an interrupt in the user program (IA/RA operations), the interrupt
response time under worst-case conditions is calculated as follows:
T
OB2 response, worst case
If you disable an interrupt in the user program, the interrupt response time will be extended by
the execution time of the program sequence for which the interrupt is disabled (max. 5 ms).
12-14
of organization block OB2.
OB2
3 ms+T
OB2
5.6 ms+T
OB2
, depends on:
OB2 response
S5-95F
EWA 4NEB 812 6210-02
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