Rockwell-automation 1747-PCIS API Software - Open Controller Uživatelský manuál stáhnout pdf (Strana 74)

Publication 1747-UM002A-US-P - June 2000

6-14 Library of Routines

Description:

This function enables or disables the scanner from scanning the

module in a specific

slotnum. This applies to both the input and

output scan. Slots that are disabled are not included in the I/O scan.

By default, all slots are enabled.

Return Value:

Considerations:

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

Example:

HANDLE Handle;

int retcode;

retcode = OC_EnableSlot( Handle, 6, SLOT_DISABLE ); /*

Exclude slot 6 */

OC_ErrorMsg

OC_ErrorMsg returns a descriptive text message associated with the

API return value errcode.

Syntax:

int OC_ErrorMsg(int errcode, char **msg);

Description:

The null-terminated message string is placed in a static buffer that is

reused each time this function is called. A pointer to this buffer is

returned in msg.

Name: Value: Description:

SUCCESS 0 module was updated successfully

ERR_OCACCESS 2

handle does not have access to scanner

ERR_OCNOFORCES 15 no forces installed, scanner cannot enable forces

ERR_OCPARAM 8 parameter contains invalid value

ERR_OCRESPONSE 10 scanner did not respond to request

ERR_OCSCANCFG 14 scanner has not been configured

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Rockwell-automation 1747-PCIS API Software - Open Controller Uživatelský manuál Strana 74