Rockwell-automation 1747-PCIS API Software - Open Controller Uživatelský manuál stáhnout pdf (Strana 126)

Publication 1747-UM002A-US-P - June 2000

6-66 Library of Routines

OC_SetupPowerFail

Action

OC_SetupPowerFailAction registers the action to be taken when a

power fail interrupt is received from the scanner.

Syntax:

int OC_SetupPowerFailAction(HANDLE handle,

BYTE *bufptr, WORD offset, WORD length, void

(*callback)() );

Parameters:

Description:

You can configure the power failure action in four ways:

• No action (default); the power failure interrupt is ignored

(bufptr is NULL; callback is NULL)

• Copy a block of data to the host retentive data partition in dual

port RAM (bufptr points to the data to save; callback is

NULL)

• Execute a user callback function (bufptr is NULL; callback

points to the routine to call)

• Copy a block of data and execute a callback function (bufptr

points to the data to save; callback points to the routine to

call)

Parameter: Description:

handle Must be a valid handle returned from OC_OpenScanner

bufptr If

bufptr is:

NULL no data is copied (default)

Not NULL at power fail

length bytes of data are copied

from

bufptr to the host retentive data partition

starting at

offset.

offset Specifies the offset within the host retentive data partition to begin

copying

length Number of bytes to copy

length points beyond the end of the host retentive data partition,

it is truncated

callback If

callback is:

NULL no callback function is executed (default)

Not NULL the power fail interrupt routine calls this function

after copying the data to the host retentive data

partition (if configured)

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