SFC14 and SFC15 are not working with my configuration

Rule for 1 byte to 32 bytes data consistency on PROFIBUS DP:

• The address area of consistent data in the process image is automatically updated.
• You can also use SFC14 "DPRD_DAT" and SFC15 "DPWR_DAT" to read and write consistent data.
• SFC14 and SFC15 are required to read and write consistent data of address areas which are not available in the process image.The length of areas with "Total length" consistency accessed by the SFC must match the programmed range.
• Direct access to consistent areas is also possible (L PEW or T PAW, for example).
• PROFIBUS DP supports the transfer of up to 32 bytes of consistent data.

You can look at this manual on the following link:
http://support.automation.siemens.com/WW/view/en/13008499

Make sure the total length of the consistent data transfer is less than 32 bytes, and that the areas match the designated source and destination areas in your PLCs.

Hope this helps,
Daniel Chartier