Rockwell Automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User Manual - Manual (Page 257)

API Library of Routines
Appendix B
TAG_READ
B-126
Description
Use the TAG_READ function to read data from a tagged memory area.
This function guarantees that the read data area is semaphored during the
read operation.
C Example
unsigned my_fred;
unsigned status;
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status = TAG_READ (“Fred”,0,sizeof(my_fred),&my_fred,30);
BASIC Example
The BASIC function code is 66.
DIM status : INTEGER
DIM tag_id : INTEGER
DIM my_data : INTEGER
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rem * TAG_READ - read 4 bytes from a tag, starting at offset 0 into
rem * my_data with a timeout of 30 seconds.
RUN AB_BAS (66,status,tag_id,0,4,ADDR(my_data),30)
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References
TAG_LINK(); TAG_DEFINE(); TAG_UNDEF();
TAG_GLOBAL_UNDEF(); TAG_WRITE(); TAG_LOCK();
TAG_UNLOCK(); TAG_READ_W(); TAG_WRITE_W();