Rockwell-automation 1747-PCIS API Software - Open Controller Manual de usuario descargar pdf (Pagina 121)

Publication 1747-UM002A-US-P - June 2000

Library of Routines 6-61

Example:

HANDLE Handle;

int retcode;

retcode = OC_SetModuleInterrupt( Handle, 6, IOINT_ENABLE );

/* Slot 6 module now enabled to generate module interrupts. */

/* Use OC_PollScanner() to check for Module Interrupt

messages. */

OC_SetOutputUpdate

Mode

OC_SetOutputUpdateMode controls how the scanner updates real

outputs from the Output Image.

Syntax:

int OC_SetOutputUpdateMode(HANDLE handle, int mode);

Parameters:

Description:

This function does not affect input image scanning.

Setting the output update mode to OUTUPD_NEVER allows the host

application to read the input image and perform logic to determine

the initial state of outputs. Once the output image is written with the

initial state data, the output update mode can be changed to allow

updating of the outputs.

Parameter: Description:

handle Must be a valid handle returned from OC_OpenScanner

mode If

mode is:

OUTUPD_NEVER the scanner does not write outputs from

the output image unless explicitly

requested by the OC_DemandOutputScan

function

OUTUPD_CHANGE the scanner writes outputs only when the

scanner output image is written via

OC_WriteOutputImage, but does not

continuously update outputs from the

output image every scan

OUTUPD_ALWAYS the scanner continuously updates outputs

from the output image on every scan.

By default, the output update mode is OUTUPD_NEVER. A change

in status of the output update mode will take effect at the start of

the next scan.

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Rockwell-automation 1747-PCIS API Software - Open Controller Manual de usuario Pagina 121