Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario descargar pdf (Pagina 204)

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Appendix B



B-73

Initiates an operation that reads a data element of the PLC-5 programmable

controller, modifies some of the bits based on mask values, then writes the

data element back. This function can read and modify any elements of the

file using only one data definition.

Important: To use this function call, you must have the versions of the

ABLIB.L and CORPRO.H files that accompany Series A Revision D

(1.20) or later of the Program Development Software. Contact Allen-

Bradley Global Technical Support Services at (216) 646-6800 if you need

these updates.

C Syntax

#include <copro.h>

unsigned DTL_RMW_W_IDX (name_id, and_mask, or_mask, iostat, index)

unsigned name_id;

unsigned and_mask;

unsigned or_mask;

unsigned *iostat;

unsigned index;

Parameters

name_id

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

modified is defined.

and_mask

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

A “1” bit in the AND mask preserves the corresponding bit in the data;

a “0” bit forces the corresponding bit to zero.

or_mask

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

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

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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



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

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DTL_RMW_W_IDX

1 2 ... 199 200 201 202 203 204 205 206 207 208 209 ... 311 312

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