Rockwell-automation 1747-PCINT API Software for 1746 I/O Uživatelský manuál stáhnout pdf (Strana 71)

OC_EnableSlot Library of Routines 6–17

Publication 1747-6.5.3 June 1998

OC_EnableSlot OC_EnableSlot enables fine tuning of the I/O scanning process.

Syntax:

int OC_EnableSlot(HANDLE handle, int slotnum, int state);

Parameters:

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 */

Parameter: Description:

handle

Must be a valid handle returned from OC_OpenScanner

slotnum

Must contain a valid slot number.

state

If state is:

SLOT_ENABLE the module is released from its reset state and is

included in the I/O scan

SLOT_DISABLE the module is no longer included in the I/O scan and

any outputs remain at their last state

Name: Value: Description:

SUCCESS

module was updated successfully

ERR_OCACCESS

handle does not have access to scanner

ERR_OCNOFORCES

no forces installed, scanner cannot enable forces

ERR_OCPARAM

parameter contains invalid value

ERR_OCRESPONSE

scanner did not respond to request

ERR_OCSCANCFG

scanner has not been configured

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Rockwell-automation 1747-PCINT API Software for 1746 I/O Uživatelský manuál Strana 71