Rockwell-automation 1747-PCIS API Software - Open Controller Manual de usuario descargar pdf (Pagina 84)

Publication 1747-UM002A-US-P - June 2000

6-24 Library of Routines

OC_GetMeasuredScan

Time

OC_GetMeasuredScanTime returns the maximum and last observed I/

O scan times.

Syntax:

int OC_GetMeasuredScanTime(HANDLE Handle, WORD

*maxtime, WORD *lasttime);

Parameters:

Description:

The scanner calculates these values at the end of each I/O scan. The

values are represented in units of 250 microseconds.

The scan times are reset to zero when changing to Scan mode, and

are not valid until the end of the second I/O scan. Only the timed I/O

scans are measured; the demand input or output scans are not.

Return Value:

Considerations:

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

Example:

HANDLE Handle;

WORD max_time, last_time;

int retcode;

retcode = OC_GetMeasuredScanTime( Handle, &max_time,

&last_time );

Parameter: Description:

handle Must be a valid handle returned from OC_OpenScanner

maxtime Returns the maximum scan time

lasttime Returns the last scan time

Name: Value: Description:

SUCCESS 0 measured scan time was read successfully

ERR_OCACCESS 2

handle does not have access to scanner

ERR_OCINIT 5 scanner has not been initialized, see OC_InitScanner

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Rockwell-automation 1747-PCIS API Software - Open Controller Manual de usuario Pagina 84