Prosoft-technology MVI56E-LDM Manual do Utilizador descarregar pdf (Página 141)

ControlLogix Platform ♦ "C" Programmable CIP API Functions

Linux Application Development Module Developer's Manual

ProSoft Technology, Inc. Page 135 of 264

March 12, 2014

OCXcip_AccessTagDataDb

Syntax

int OCXcip_AccessTagDataDb (OCXHANDLE apihandle,

OCXTAGDBHANDLE tdbHandle,

OCXCIPTAGDBACCESS ** pTagAccArr,

WORD numTagAcc,

WORD * pAbortCode);

Parameters

apiHandle

handle returned by previous call to OCXcip_Open

tdbHandle

handle created by previous call to

OCXcip_CreateTagDbHandle

pTagAccArr

Pointer to array of pointers to tag access definitions:

tagName = Pointer to tag name string

(symName[x,y,z].mbr[x].etc. All array indices must be specified

except the last set of brackets - if the last set is omitted, the

indices are assumed to be zero.

daType = Data type code (OCX_CIP_DINT, etc).

eleSize = Size of a single data element (DINT = 4, BOOL = 1,

etc).

opType = OCX_CIP_TAG_READ_OP or

OCX_CIP_TAG_WRITE_OP.

numEle = Number of elements to read or write - must be 1 if not

array.

data = Pointer to read/write data buffer. The size of the data is

assumed to be numEle * eleSize.

wrMask = Write data mask. Set to NULL to execute a non-

masked write. If a masked write is specified, numEle must be 1

and the total amount of write data must be 8 bytes or less. Only

signed and unsigned integer types may be written with a masked

write. Only data bits with corresponding set wrMask bits will be

written. If a wrMask is supplied, it is assumed to be the same

size as the write data (eleSize * numEle).

result = Read/Write operation result (output). Set to

OCX_SUCCESS if operation successful, else if failure. This value

is not set if the function return value is other than OCX_SUCCESS

or opType is OCX_CIP_TAG_NO_OP.

numTagAcc

Number of tag access definitions to process.

pAbortCode

Pointer to abort code. This allows the application to pass a large

number of tags and gracefully abort between accesses. May be

NULL. *pAbort may be OCX_ABORT_TAG_ACCESS_MINOR to

abort between tag accesses or

OCX_ABORT_TAG_ACCESS_MAJOR to abort between CIP

packets.

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