Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario descargar pdf (Pagina 127)

OC_SetScanTime Library of Routines 6–73

Publication 1747-6.5.3 June 1998

OC_SetScanTime OC_SetScanTime sets the I/O scan time and I/O scan interval of the scanner.

Syntax:

int OC_SetScanTime(HANDLE handle, int mode, int time);

Parameters:

Description:

A scan time change will take effect when the scanner transitions from Idle mode to Scan mode.

Return Value:

Considerations:

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

Example:

HANDLE Handle;

int retcode;

retcode = OC_SetScanTime( Handle, SCAN_PERIODIC, 20 );

/* Scan set to start every 5 msec. */

Parameter: Description:

handle

Must be a valid handle returned from OC_OpenScanner

mode

time

If mode is:

SCAN_PERIODIC time determines the frequency of I/O scans in

multiples of 250us and must contain a value

between 1 and 255.

SCAN_DELAYED time determines the delay between I/O scans in

multiples of 10us and must contain a value

between 1 and 256.

The default

mode is SCAN_PERIODIC and the default time is 10 if

OC_SetScanTime is not used to change the scan time.

Name: Value: Description:

SUCCESS

scan time was set successfully

ERR_OCACCESS

handle does not have access to the scanner

ERR_OCINIT

scanner has not been initialized, see OC_InitScanner

ERR_OCPARAM

parameter contains invalid value

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Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario Pagina 127