ProfiNet I/O Diagnostic for SCALANCE

Hello All

I'm using 315 2DP/PN CPU as a PN I/O controller, that is connected in redundant ring form, to 19 SCALANCE X204 units, via PN I/O.
I already defined all necessary configurations for all units: IP, Name, Manager etc.
Everything works just fine, and every fault is been detectet by the CPU.

So, my only problem is to have this SCALANEs diagnostics on my step 7 program, and create a DB for the HMI (Not WinCC!)
I already checked on forums, and read all available documents, but could not find what I need.
i don't want to use the famous FB 125 or 126, since i don't use WinCC. I don't want to use SER with FB 49 etc., since I need a continues check, And when i tried to use the OB 83,86 interrupts, it does not work 100% right (On case the unit on fault, and then I turn on the CPU, and on other edge cases).

So, after reading the excellent document "Von_PROFIBUS_DP_nach_PROFINET_IO_en-US" I still can not manage the promising SFB52. Can someone please help me on that? How can I diagnose my 19 SCALACE units ???

Thanks in advanced,
YuvalG,