Siemens SIMATIC NET PROFIBUS Manuel de service Page 45

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Overview of the DP Base Interface
DP Base Programming Interface for CP 5613/CP 5614
C79000-G8976-C108-01
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3.6 Overview of Triggering and Receiving Events
Properties of Hardware Events
The CP 5613/CP 5614 supports hardware events (see Section 3.4) with hardware
mechanisms of the CP so that these can be processed extremely quickly.
Hardware events (with the exception of fast logic) are activated in the process
image of the CP, signaled by semaphores and the details of the event are located
in the process image.
Properties of Software Events
Software events, on the other hand, are triggered by function calls, can be signaled
by semaphores and are fetched again by function calls.
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