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S5-95F
Minimum Signal Duration for OB2 Interrupts
Note
An OB2 interrupt is triggered by a negative edge at an OB2 interrupt input. The S5-95F
can detect the edge under worst-case conditions only when signal levels "0" and "1"
have a duration of at least 4 ms . For this reason, be sure to use suitable sensors (do
not use fleeting contacts or rebound switches).
Frequency of OB2 Interrupts
Note
The primary objective of interrupt processing in OB2 is to reset an onboard DQ as
quickly as possible when the signal edge at an interrupt input changes. An OB2
interrupt input is not suitable for counting high-frequency periodic pulses. As a
guideline, we would recommend that OB2 not be invoked more often than every
50 ms via the same interrupt input. If it is invoked more frequently, the S5-95F might
detect a discrepancy time error at the interrupt DI. In this case, the S5-95F reacts by
issuing an error message and performing the parameterized system response (STOP or
passivation).
EWA 4NEB 812 6210-02
Interrupt Processing
12-15
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