Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Bedienungsanleitung PDF herunterladen (Seite 201)

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Appendix B



B-70

Initiates an operation that reads a data element, modifies some of the bits,

then writes it back.

C Syntax

#include <copro.h>

unsigned DTL_RMW_W (name_id, and_mask, or_mask, iostat)

unsigned name_id;

unsigned and_mask;

unsigned or_mask;

unsigned *iostat;

Parameters

name_id

DTL_C_DEFINE returns this handle when the data item to be read and

modified is defined.

and_mask

Use the and_mask to specify the bits you want to preserve in the data

item. A “1” bit in the AND mask preserves the corresponding bit in the

data item; a “0” bit forces the corresponding bit to zero.

or_mask

Use or_mask to specify the bits you want to set in the data item.

A “1” bit in the OR mask forces the corresponding bit in the data item;

a “0” bit forces the corresponding bit unchanged. The OR mask is

applied after the AND mask.

iostat

Returns a final completion status. Possible completion status values are:

Value Meaning



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   !.2 *)0",-&*) ",,*,





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

"" '"  #*,  ",,*,-

DTL_RMW_W

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Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Bedienungsanleitung Seite 201