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Description of the DP Functions, Data, and Error Codes

DP Base Programming Interface for CP 5613/CP 5614

162

C79000-G8976-C108-01

4.3.11 Activating/Deactivating the Generation of Hardware Events

Overview

In the process image of the CP 5613/CP 5614, there is a memory area in which

you can activate the triggering of hardware events for a new DP cycle, data

changes, or the arrival of diagnostic data.

Hardware events for changes in slave input data and diagnostic data can be set

separately for each individual slave.

The events are indicated by incrementing semaphores.

Example of Activation

"p" is a pointer to the process image that your user program obtained with the

"DP_get_pointer" call. To activate events at the start of the cycle, when data

changes and when diagnostic data arrive, you would write a program like the one

below:

/* Activate event at the start of the cycle */

p->ctr.D_cycle_start_mask = 0;

/* Activate event if slave 5 data changes 5 */

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

/* Activate event if diagnostic data arrive

from slave 5 */

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

Afterwards, when events arrive, the semaphores initialized by your user program

with DP_init_sema_object are incremented.

The other possible values for "req_mask" are:

DPR_DATA_INT_CLEAR_AND_MASK

– Waiting for an event, but then no

setting of the semaphore, and

DPR_DATA_CHANGE

– an event has arrived.

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Siemens SIMATIC NET PROFIBUS Manual de Serviço Página 162