Rockwell-automation 1747-PCIS API Software - Open Controller Bedienungsanleitung PDF herunterladen (Seite 127)

Publication 1747-UM002A-US-P - June 2000

Library of Routines 6-67

A system typically has at least 10 milliseconds, and possibly as much

as 50 milliseconds or more between the power fail interrupt and the

loss of power. The duration of this interval is a function of the power

supply and system configuration, and it varies from system to system.

You might need to experiment to determine the typical value for a

particular system.

Data is copied to the host retentive data partition at the rate of

approximately 1K bytes per millisecond.

Declare

bufptr as static if the OC_SetupPowerFail function is used

other than in

main( ); otherwise random data will be sent to the host

retentive data area.

Return Value:

Considerations:

Supported in the DOS API library only.

Example:

This example is for DOS only.

HANDLE Handle;

BYTE buffer1[100];

BYTE buffer2[100];

int retcode;

void PowerFailSave( void )/* power fail callback routine */

{

len = 100;

OC_WriteRtcSRAM( buffer2, 0, &len );/* Put data in protected

area */

}

retcode = OC_SetupPowerFailAction( Handle, buffer1, 0,

100, PowerFailSave );

Name: Value: Description:

SUCCESS 0 power fail action was registered successfully

ERR_OCACCESS 2

handle does not have access to 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 Bedienungsanleitung Seite 127