Siemens SIMATIC NET PROFIBUS Manual de servicio descargar pdf (Pagina 149)

Description of the DP Functions, Data, and Error Codes

DP Base Programming Interface for CP 5613/CP 5614

C79000-G8976-C108-01

149

Example of Consistent Writing

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

"DP_get_pointer" call. Then 200 bytes from a local buffer "buf" are written to slave

5 as follows:

/* Copy data */

memcpy(&p->pi.slave_out[5].data[0], buf, 200);

/* Trigger transfer */

p->ctr. D_out_slave_adr = 5;

Warning

The lock is canceled by the following:



Locking a different slave to read its input data (Section 4.3.1)



Locking a different slave to read its diagnostic information

Note 1

The data is only transferred to the slave when the master is in the OPERATE

mode and the slave is in the READY state.

Note 2

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

CP 5614.

Note 3

The output data are not sent as long as the slave reports static diagnostic data

(Section 4.6.2, byte 2 - stationstatus_2, bit 1).

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Siemens SIMATIC NET PROFIBUS Manual de servicio Pagina 149