Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario descargar pdf (Pagina 118)

6–64 Library of Routines OC_SetForces

Publication 1747-6.5.3 June 1998

OC_SetForces OC_SetForces installs and removes input and output forces to the scanner.

Syntax:

int OC_SetForces(HANDLE handle, FORCEDATA *forcedata)

Parameters:

Description:

If the result of OC_SetForces removes all I/O forces, the scanner disables forces. If any I/O forces are later

installed, OC_EnableForces must be called to re-enable forces.

The

FORCEDATA structure is defined as:

typedef struct tagFORCEDATA {

BYTE SlotNum; /* Slot Number of local I/O or 1747-SN module (1-30)*/

WORD WordOffset; /* Word Offset in I/O image */

BYTE IOType; /* Selects Input or Output Image */

WORD ForceMask; /* Install/Remove bitmask */

WORD ForceVal; /* Install value bitmask */

} FORCEDATA;

Parameter: Description:

handle

Must be a valid handle returned from OC_OpenScanner

forcedata

Defines the inputs and outputs to force.

This value: Means:

SlotNum

WordOffset

SlotNum and WordOffset select the word of I/O that contains the bits

to be forced

IOType

IOType must be FORCE_INPUTS or FORCE_OUTPUTS

ForceMask

ForceVal

All 16 bits of the word are installed/removed according to ForceMask

and ForceVal

Each bit in ForceMask that is set to 0 will have its force removed. Each

bit in

ForceMask that is set to 1 will have its force installed. For each bit

that has its force installed, the corresponding bit in

ForceVal determines

the state of the force. For bits that have their force removed, the

corresponding bit in ForceVal is ignored.

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Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario Pagina 118