Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario descargar pdf (Pagina 83)

OC_GetLastFaultCause Library of Routines 6–29

Publication 1747-6.5.3 June 1998

OC_GetLastFaultCause OC_GetLastFaultCause retrieves the cause of the last fault.

Syntax:

int OC_GetLastFaultCause(HANDLE handle, BYTE *FaultCode, int *SlotNum);

Parameters:

Description:

When the scanner faults, an extended error is generated. The error code and slot number of the most recent

fault is retained and returned by this function. The fault cause is a duplicate of the most recent extended error.

The OC_ClearFault function clears the fault in the scanner but does not clear the cause of the last fault.

See Appendix A for error codes.

Return Value:

Considerations:

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

Example:

HANDLE Handle;

BYTE status, FaultCause;

int FaultSlot;

int retcode;

OC_GetScannerStatus ( Handle, &status );

if ( status = SCANSTS_FAULT )

{

retcode = OC_GetLastFaultCause ( Handle, &FaultCause, &FaultSlot );

}

Parameter: Description:

handle

Must be a valid handle returned from OC_OpenScanner

FaultCode

Points to the address that contains the fault cause

If the value returned in

FaultCode is 0, the scanner has not received

any faults since it has been reset.

SlotNum

Slot number that caused the fault

Name: Value: Description:

SUCCESS

fault was cleared successfully

ERR_OCACCESS

handle does not have access to scanner

ERR_OCINIT

scanner has not been initialized, see OC_InitScanner

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Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario Pagina 83