Rockwell Automation 1747-PCINT API Software for 1746 I/O - Manual (Page 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
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