Rockwell-automation 1747-PCIS API Software - Open Controller Instrukcja Użytkownika Pobierz pdf (Strona 53)

1 Publication 1747-UM002A-US-P - June 2000

Chapter

Using the API Structures

Introduction

This chapter describes the structures the API uses. These structures are

declared in

ocapi.h.

API Structures

The table below list API structures.

Structure Name: Syntax:

DII_CFG

Passed to OC_ConfigureDII.

Configures a discrete input

interrupt for a module.

typedef struct tagDII_CFG

BYTE SlotNum; /* slot number */

BYTE IOIncludeMask; /* declare which Discrete Inputs can cause interrupts */

BYTE IOEdgeType; /* select required transition of each discrete input */

WORD PresetCount; /* set the number of transitions required to cause interrupt */

} DII_CFG;

FORCEDATA

Passed to OC_SetForces.

Configures input and output

forces.

typedef struct tagFORCEDATA

{

BYTE SlotNum; /* slot number */

WORD WordOffset; /* offset to word to force */

BYTE IOType; /* selects force inputs or outputs */

WORD ForceMask; /* bits set to 1 are forced, 0 removes forces */

WORD ForceVal; /* selects force state of bits set to 1 in ForceMask */

} FORCEDATA;

MSGBUF

Returned by OC_PollScanner.

MsgID identifies the

message type. Type-specific

data is contained in

MsgData[ ].

#define OCMSGDATASIZE4 /* number of bytes of message data */

typedef struct tagMSGBUF

{

BYTE MsgID; /* Message type */

BYTE MsgData[OCMSGDATASIZE];/* Type-specific data */

} MSGBUF;

OCEXTERR

Returned by

OC_GetExtendedError. I/O

error report from scanner.

#define OCERRDATASIZE3 /* number of bytes of error data */

typedef struct tagOCEXTERR

{

BYTE ErrorCode; /* Extended error code */

BYTE SlotNum; /* Associated slot number */

BYTE ErrorData[OCERRDATASIZE];/* Error code data */

} OCEXTERR;

OCINIT

Passed to OC_InitScanner

function to specify dual port

RAM partition sizes for

output image, input image,

and host retentive data.

typedef struct tagOCINIT

{

WORD OutputImageSize; /* size in bytes */

WORD InputImageSize; /* size in bytes */

WORD HostRetentiveDataSize;/* size in bytes */

} OCINIT;

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