Rockwell-automation 1747-PCIS API Software - Open Controller Uživatelský manuál stáhnout pdf (Strana 122)

Publication 1747-UM002A-US-P - June 2000

6-62 Library of Routines

Setting the output update mode to OUTUPD_CHANGE allows the

host application to signal the scanner to write outputs by calling

OC_WriteOutputImage. This setting allows the scanner’s minimum

scan time to be reduced (since it is only scanning inputs most of the

time), and is provided as a performance enhancement.

Setting the output update mode to OUTUPD_ALWAYS forces the

scanner to write outputs from the output image on every scan.

Return Value:

Considerations:

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

Example:

HANDLE Handle;

int retcode;

retcode = OC_SetOutputUpdateMode( Handle, OUTUPD_NEVER );

/* Must use OC_DemandOutputScan() function to send new output

data */

Name: Value: Description:

SUCCESS 0 conditional scan was set successfully

ERR_OCACCESS 2

handle does not have access to the scanner

ERR_OCINIT 5 scanner has not been initialized, see OC_InitScanner

ERR_OCPARAM 8 parameter contains invalid value

1 2 ... 117 118 119 120 121 122 123 124 125 126 127 ... 173 174

Žádné komentáře

Rockwell-automation 1747-PCIS API Software - Open Controller Uživatelský manuál Strana 122