Rockwell-automation 1747-PCIS API Software - Open Controller Uživatelský manuál stáhnout pdf (Strana 89)

Publication 1747-UM002A-US-P - June 2000

Library of Routines 6-29

OC_GetScanner

WatchdogCount

OC_GetScannerWatchdogCount reads the contents of the watchdog

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 0 watchdog was read successfully

ERR_OCACCESS 2

handle does not have access to scanner

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Rockwell-automation 1747-PCIS API Software - Open Controller Uživatelský manuál Strana 89