Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario descargar pdf (Pagina 89)

OC_GetScanner WatchdogCount Library of Routines 6–35

Publication 1747-6.5.3 June 1998

OC_GetScanner

WatchdogCount

OC_GetScannerWatchdogCount reads the contents of the watchdog register of the

scanner.

Syntax:

int OC_GetScannerWatchdogCount(HANDLE handle, BYTE *count);

Parameters:

Description:

The watchdog register is incremented by the scanner after every timed I/O scan.

This register is incremented in both Scan and Idle modes, and is incremented even if both output and input

scans are disabled. The control application can monitor this register to ensure that the scanner is functioning

normally. It is also useful for synchronizing with the I/O scan.

Return Value:

Considerations:

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

Example:

HANDLE Handle;

BYTE wdog_count;

int retcode;

retcode = OC_GetScannerWatchdogCount( Handle, &wdog_count );

Parameter: Description:

handle

Must be a valid handle returned from OC_OpenScanner

count

Returns the watchdog register contents

Name: Value: Description:

SUCCESS

watchdog was read successfully

ERR_OCACCESS

handle does not have access to scanner

1 2 ... 84 85 86 87 88 89 90 91 92 93 94 ... 154 155

Sin comentarios

Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario Pagina 89