Read function block parameter with its object dictionary index in VC?

[DebL]

How do I read  a function block parameter with its object dictionary index using NI-Fbus Communications Manager Programmer VC API?

[Vince Shen]

You can use  marco NIFB_INDEX(index) as parameter for nif_ReadObject function. The index is the relative index of the parameter in the block.

nifError_t nifReadObject(nifDesc_t ud, NIFB_INDEX(uint32 idx), void *buffer, uint8 *length)

Please also refer to 'NI-FBUS Hardware and Software User Manual' from Start->National Instruments->NI-FBUS->Manuals. Page 6-41 ~ Page 6-44 describe the detail information about nifReadObject() function.

Page 6-51 ~ Page 6-52 explain the usage of marcos for processing index.

[DebL]

Thanks for the feedback.

After read the manual you recommended, I think I can do the following to read a parameter with its OD index:

the relative index of the parameter in the block = the parameter OD index - the starting OD index of the block

Then use the marco NIFB_INDEX( parameterRelativeIndex ) with nif_ReadObject function to read the parameter