Rockwell-automation 1747-PCIS API Software - Open Controller Manual do Utilizador descarregar pdf (Página 81)

Publication 1747-UM002A-US-P - June 2000

Library of Routines 6-21

Considerations:

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

Example:

HANDLE Handle;

BYTE count;

int retcode;

retcode = OC_GetInputImageUpdateCounter( Handle, &count );

OC_GetIOConfiguration

OC_GetIOConfiguration queries the I/O rack about the installed rack

sizes and I/O modules in each 1746 chassis.

Syntax:

int OC_GetIOConfiguration(HANDLE handle, OCIOCFG

*iocfg);

Parameters:

Description:

If the scanner is in Scan mode and OC_GetIOConfiguration returns

successfully, OC_GetIOConfiguration enables the host application to

access I/O. The scanner must have previously received a valid

configuration prior to going to Scan mode.

The OCIOCFG structure is defined as:

typedef struct tagOCIOCFG

{

BYTE Rack1Size;/* number of slots in Rack 1 */

BYTE Rack2Size;/* number of slots in Rack 2 */

ATTENTION

OC_GetIOConfiguration can take several

milliseconds to complete, depending upon the rack

configuration. While it is executing, I/O scanning

and DII’s are disabled.

Parameter: Description:

handle Must be a valid handle returned from OC_OpenScanner

iocfg Specifies the rack sizes and installed modules

Use the information in

iocfg as input to

OC_DownloadIOConfiguration to configure the scanner.

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Rockwell-automation 1747-PCIS API Software - Open Controller Manual do Utilizador Página 81