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Description of the DP Functions, Data, and Error Codes

DP Base Programming Interface for CP 5613/CP 5614

C79000-G8976-C108-01

163

Example of Deactivation

The following activation sequence would be canceled by your user program as

follows:

/* Deactivate event for cycle start */

p->ctr.D_cycle_start_mask = 1;

/* Deactivate event for slave 5 data change */

p->ef.input[5].req_mask = DPR_DATA_INT_CLEAR_AND_MASK;

/* Deactivate event if diagnostic data arrive

from slave 5 */

p->ef.diag[5].req_mask = DPR_DATA_INT_CLEAR_AND_MASK;

Note 1

If your user program has not yet passed through a semaphore, it will not be

incremented again. When the program passes through a semaphore, you should

therefore always check whether multiple events have already occurred.

Note 2

When a hardware event is received, the correspondin

control condition is reset so

that your user program must set it again. This avoids overload on your PC when

your user program does not process hardware events quickly enough.

Note 3

The use of hardware events for a lot of active slaves at the same time puts greater

load on the PC than polling; refer to the suggestions in the FAQ list.

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Siemens SIMATIC NET PROFIBUS Manual de servicio Pagina 163