Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario descargar pdf (Pagina 134)

" 

Appendix B



B-3

Gets the updated output-image word and optionally sets the input-

image word.

Important: Only a single task should use the BPI functions. A second

calling process is put to sleep if the BPI is already in use. The second task

could time out unexpectedly.

C Syntax

#include <copro.h>

unsigned short BPI_DISCRETE (mode, input_img)

int mode;

unsigned short input_img;

Parameters

mode

Specifies whether or not the function sends a new value to the

programmable controller input image table using NO_MODIFY or

MODIFY (defined in COPRO.H).

Important: If the mode parameter is invalid (i.e. does not equal MODIFY

or NO_MODIFY), then the function will force the mode to NO_MODIFY.

It is difficult to return an error in this case because the expected return is

the output-image value from the programmable-controller data table.

input_img

The value sent to the programmable-controller input-image table at the

address corresponding to the control coprocessor’s physical address

(according to rack and slot).

Returns

Variable Meaning

 

     # !    

Description

Use the BPI_DISCRETE function to return the programmable controller’s

updated output-image word for the control-coprocessor backplane I/O slot.

The function can also update the control-coprocessor input-image word in

the programmable-controller input image using the

input_img parameter.

BPI_DISCRETE

1 2 ... 129 130 131 132 133 134 135 136 137 138 139 ... 311 312

Sin comentarios

Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario Pagina 134