Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario descargar pdf (Pagina 199)

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Appendix B

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B-68

Returns

Status Symbolic Name Meaning

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Description

Use the DTL_READ_W_IDX function to read a file, one element at a

time, from a PLC-5 programmable controller that is directly connected to

the control coprocessor.

This function is synchronous. When this function is initiated, your

C application programs stops until the function completes or fails.

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 can address structured data types to either the structure level or the

element level. When you address to the structure level, the data type must

be RAW.

Valid Definition Examples

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

default 1 item */

DTL_C_DEFINE (&idl, “T4:0.pre”) /* index 0 accesses T4:0.pre; index 14

accesses T4:14.pre */

DTL_C_DEFINE (&idl, “T4:0,1,raw”) /* index 0 accesses all three elements of

T4:0 (control, preset, accumulator);

index 14 access all three elements

of T4:14 (control, preset, accumulator)*/

Invalid Definition Example

DTL_C_DEFINE (&idl, “N34:3”) /* not specified to element 0 */

DTL_C_DEFINE (&idl, “N34:0,3,long”) /* number of items not 1 */

1 2 ... 194 195 196 197 198 199 200 201 202 203 204 ... 311 312

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Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario Pagina 199