Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Uživatelský manuál stáhnout pdf (Strana 267)

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Appendix B

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B-136

Description

Use TAG_WRITE_W to write data to a tagged memory area. This

function writes the data, then it waits until a corresponding

TAG_READ_W is posted. This function guarantees that the write data

area is semaphored during the write operation.

C Example

unsigned my_fred;

unsigned status;

my_fred = 42;

status = TAG_WRITE_W (“Fred”,0,sizeof(my_fred),&my_fred,30);

BASIC Example

The BASIC function code is 67.

DIM status : INTEGER

DIM tag_id : INTEGER

DIM w_data : INTEGER

rem * TAG_WRITE_W - write 4 bytes to a tag, starting at offset 0 from

rem * w_data with a timeout of 30 seconds. This function

rem * will return only after the tag has been read by

rem * TAG_READ_W or a timeout.

RUN AB_BAS (67,status,tag_id,0,4,ADDR(w_data),30)

References

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

TAG_GLOBAL_UNDEF(); TAG_READ(); TAG_LOCK();

TAG_UNLOCK(); TAG_READ_W(); TAG_WRITE();

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Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Uživatelský manuál Strana 267