Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario descargar pdf (Pagina 266)

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Appendix B



B-135

Writes data to a user’s TAG memory area then waits for it to be read by

a TAG_READ_W.

C Syntax

#include <copro.h>

unsigned TAG_WRITE (tag,offset,size,buffer,timeout)

unsigned tag;

char *tag;

unsigned offset;

unsigned size;

unsigned char *buffer;

unsigned timeout;

Parameters

tag

Use to access the TAG table. This can be either the symbolic TAG or

the handle returned from a TAG_LINK or TAG_DEFINE call.

offset

A byte offset from the start of the tagged area from where data will

be written.

size

Specifies the number of bytes to write to the tagged area.

buffer

Specifies the buffer to copy the write data write to the tagged area.

timeout

Timeout value in seconds (valid range 0-16383). The function will

timeout unless the TAG can be written before the timeout expires.

The TAG may not be able to be written if another process has the

TAG locked or if the corresponding TAG_READ_W from another

process has not been issued. A value of CC_FOREVER (defined in

COPRO.H) will cause this function to wait indefinitely until the

TAG can be written.

Returns

Value Symbolic Name Meaning



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   #$%(,$  -21 -% / ,&$

   1 0(7$ &/$ 1$/ 1' , 1'$ + 5(+2+ **-4$#

  ,3 *(# 1(+$-21 3 *2$

  (# ,-1 "-+.*$1$ (, 1(+$  *-")$#

  (# ,-1 "-+.*$1$ (, 1(+$ 1'$  ,-1 /$ #

   4/(1$ (0 */$ #6 .$,#(,& -, 1'(0 

   ,-1 %-2,#

   (0  -,*6

TAG_WRITE_W

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