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API functions 3

 19

3.4.7 PDO functions

BpbReadPdo function

Parameter

[in] HANDLE hOpen Pointer to open context (handle) for identification

[out] PUCHAR pReadBuffer PDO memory area

[in] WORD usBufferSize Size of the memory area

[out] PWORD pusActualPdoSize Size of the memory area assigned

Return values

S_OK Successful

E_HANDLE Incorrect (handle is invalid)

E_MEMORY Incorrect (BPB message memory area overflown)

BpbWritePDO function

Parameter

[in] HANDLE hOpen Pointer to open context (handle) for identification

[in] PUCHAR pWriteBuffer PDO memory area

[in] USHORT usBufferSize Size of the memory area

[out] PUSHORT pusSdoWritten Number of PDOs written

Return values

S_OK Successful

E_HANDLE Incorrect (handle is invalid)

PDO block structure

The structure of the process data results from the group configuration of the I/O

modules.

Size of the PDO memory area 1. DWORD

Status register 2. DWORD

BpbPdoBlockHeader

SDOs

3. DWORD

…

n. DWORD

(binary data, according to process

image)

After a read or write access the status register contains the current status of the BPB

and does not serve to change the status of the BPB.

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