Rockwell-automation 1747-PCIS API Software - Open Controller Manual do Utilizador descarregar pdf (Página 124)

Publication 1747-UM002A-US-P - June 2000

6-64 Library of Routines

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

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 0 scan time was set successfully

ERR_OCACCESS 2

handle does not have access to the 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 124