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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

153

Example

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

"DP_get_pointer" call. To count, for example, how many slaves are in the READY

state, you would write a program like that shown below, where "sum" contains the

result:

unsigned short sum = 0;

unsigned short i;

for (i = 0; i< DPR_MAX_SLAVE_ADDR; i++)

{

if (p->info_watch.slave_info[i].slave_state ==

DPR_SLV_READY)

{

sum++; /* found */

}

There is also the DPR_SLV_NOT_READY state that also includes non-configured

slaves.

Note 1

The DP master automatically attempts to reinitialize slaves in the NOT READY

state and to include them in cyclic processing.

Note 2

The user program must not overwrite the slave_state variable.

Note 3

The memory area with index 127 contains the state of the slave module of the

CP 5614.

Note 4

If the slave is in the READY state, this does not necessarily mean that its data are

valid. Diagnostic data may mean that the validity of the data is restricted.

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Siemens SIMATIC NET PROFIBUS Manual de servicio Pagina 153