Rockwell-automation 1747-PCIS API Software - Open Controller Bedienungsanleitung PDF herunterladen (Seite 68)

Publication 1747-UM002A-US-P - June 2000

6-8 Library of Routines

The scanner updates the input image with data read from the

modules. Use OC_ReadInputImage to read data from the input image.

Return Value:

Considerations:

Supported in the DOS API library and the Windows NT API library

Example:

HANDLE Handle;

int retcode;

retcode = OC_DemandInputScan( Handle, OCWAIT );

OC_DemandOutputScan

OC_DemandOutputScan forces the scanner to immediately perform

an output scan.

Syntax:

int OC_DemandOutputScan(HANDLE handle, int mode);

Parameters:

Description:

The scanner updates module outputs from the data in the output

image. Use OC_WriteOutputImage to write data to the output image.

Name: Value: Description:

SUCCESS 0 demand input request was successful

ERR_OCACCESS 2

handle does not have access to scanner

ERR_OCRESPONSE 10 scanner did not respond to request

ERR_OCSCANCFG 14 scanner has not been configured

Parameter: Description:

handle Must be a valid handle returned from OC_OpenScanner

mode If

mode is:

OCWAIT OC_DemandOutputScan waits for the output scan to

be completed before returning to the caller.

OCNOWAIT OC_DemandOutputScan returns immediately.

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Rockwell-automation 1747-PCIS API Software - Open Controller Bedienungsanleitung Seite 68