Rockwell-automation 1747-PCIS API Software - Open Controller Manual do Utilizador descarregar pdf (Página 118)

Publication 1747-UM002A-US-P - June 2000

6-58 Library of Routines

Example:

HANDLE Handle;

int retcode;

retcode = OC_SetHostWatchdog(Handle, WATCHDOG_IDLE, 10 );

/* Watchdog times out in 1 second and places scanner in idle

mode */

OC_SetInputUpdate

Mode

OC_SetInputUpdateMode controls how the scanner updates inputs.

Syntax:

int OC_SetInputUpdateMode(HANDLE handle, int mode);

Parameters:

Description:

This function does not affect output image scanning.

Return Value:

Considerations:

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

Example:

HANDLE Handle;

int retcode;

retcode = OC_SetInputUpdateMode( Handle, INUPD_NEVER );

/* Must use OC_DemandInputScan() function to obtain new input

data */

Parameter: Description:

handle Must be a valid handle returned from OC_OpenScanner

mode If

mode is:

INUPD_NEVER The scanner does not scan inputs unless

explicitly requested by the

C_DemandInputScan function.

INUPD_ALWAYS The scanner continuously updates inputs

on every scan.

By default, the input update mode is INUPD_ALWAYS. A change in

status of the input update mode takes effect at start of next scan.

Name: Value: Description:

SUCCESS 0 conditional scan was set successfully

ERR_OCACCESS 2

handle does not have access to scanner

ERR_OCINIT 5 scanner has not been initialized; see OC_InitScanner

ERR_OCPARAM 8 parameter contains invalid value

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Rockwell-automation 1747-PCIS API Software - Open Controller Manual do Utilizador Página 118