Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual do Utilizador descarregar pdf (Página 255)

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Appendix B

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B-124

C Example

unsigned name_id;

unsigned status; /* status return */

int Fred_ptr [12] /* pointer to Fred data area */

int buffer [12]; /* transfer buffer */

status - TAG_DEFINE (&name_id, Fred_ptr, “Fred”, 12 * sizeof (int),TG_MODIFY);

status = TAG_LOCK (“Fred”,30); /* lock TAG Fred */

if (status = CC_SUCCESS) exit (status); /* exit if wrong TAG */

for (x=0; x<12; ++x) *Fred_ptr = buffer [x]; /* transfer data to Fred*/

status = TAG_UNLOCK (“Fred”) ; /* unlock Fred */

/* the above example from TAG_LOCK to TAG_UNLOCK would be functionally

equivalent to the following */

status = TAG_WRITE (“Fred”, 0, 12 * sizeof (int), &buffer,30);

BASIC Example

The BASIC function code is 69.

DIM status : INTEGER

DIM tag_id : INTEGER

rem * TAG_LOCK - lock the tag specified by tag_id from concurrent access

rem * the timeout is 30 seconds.

RUN AB_BAS (69,status,tag_id,30)

References

TAG_LINK(); TAG_DEFINE(); TAG_UNDEF();

TAG_READ(); TAG_WRITE(); TAG_UNLOCK();

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Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual do Utilizador Página 255