Rockwell-automation 1747-PCIS API Software - Open Controller Manual de usuario descargar pdf (Pagina 123)

Publication 1747-UM002A-US-P - June 2000

Library of Routines 6-63

OC_SetScanMode

OC_SetScanMode changes the scan mode of the scanner.

Syntax:

int OC_SetScanMode(HANDLE handle, int mode);

Parameters:

Description:

The scanner must be properly configured before going to Scan mode.

OC_SetScanMode will fail if there are any unread extended errors or

faults. Call OC_GetExtendedError to extract all extended errors and

call OC_ClearFault to clear any faults before calling OC_SetScanMode.

Before the scanner changes to Scan mode, it compares the

downloaded I/O configuration to the racks and I/O modules actually

installed. If there are any problems, an extended error is generated

and OC_SetScanMode returns an error. If the scanner finds no

problems, the scanner is in Scan mode when this function returns.

Return Value:

Considerations:

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

Example:

HANDLE Handle;

int retcode;

retcode = OC_SetScanMode(Handle, SCAN_RUN); /* Scan I/O */

Parameter: Description:

handle Must be a valid handle returned from OC_OpenScanner

mode If

mode is:

SCAN_IDLE the scanner changes to Idle mode and stops

scanning I/O

SCAN_RUN the scanner changes to Scan mode and begins

scanning I/O.

Name: Value: Description:

SUCCESS 0 scan mode was set successfully

ERR_OCACCESS 2

handle does not have access to the scanner

ERR_OCFAULT 13 scanner is faulted

ERR_OCINIT 5 scanner has not been initialized, see OC_InitScanner

ERR_OCPARAM 8 parameter contains invalid value

ERR_OCRESPONSE 10 scanner did not respond to request

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Rockwell-automation 1747-PCIS API Software - Open Controller Manual de usuario Pagina 123