Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario descargar pdf (Pagina 205)

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Appendix B

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B-74

index

This parameter specifies the element or structure level of the data-file

item to be read and modified.

Returns

Status Symbolic Name Meaning

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Description

Use the DTL_RMW_W_IDX function to perform a read/modify/write

function on a data item. This function read a data value, modifies the data

with the AND mask and then with the OR mask, and writes the data back

to the programmable controller. This function allows you to read and

modify any element of the file using only one data definition by specifying

an index to the element.

For this function to be successful, the data definition must specify the

address to the first element of the file and the number of data items

must be 1.

You cannot use this synchronous function on multiple-element data

definitions. The element must be a word value.

Valid Definition Examples

DTL_C_DEFINE (&idl, “N34:0”) /* specified to element 0,

default 1 item */

1 2 ... 200 201 202 203 204 205 206 207 208 209 210 ... 311 312

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Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario Pagina 205