Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario descargar pdf (Pagina 258)

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Appendix B

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B-127

Reads data from a user’s TAG memory area after the TAG is written

by TAG_WRITE_W.

C Syntax

#include <copro.h>

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

unsigned tag;

unsigned char *tag;

unsigned offset;

unsigned size;

unsigned *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 which data will

be read.

size

Specifies the number of bytes to read from the tagged area.

buffer

Specifies the buffer to copy the data read from the tagged area.

timeout

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

timeout unless the TAG can be read before the timeout expires. The

TAG may not be able to be read if another process has the TAG locked

or if the corresponding TAG_WRITE_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 read.

Returns

Value Symbolic Name Meaning

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TAG_READ_W

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