Problem with communicating TP170A to PLC

Problem Solved!

I first, set the node address of HMI in transfer settings to 15, then removed the HMI object from Profibus line on HWconfig,and set the WinCC address to 15 and then checked the "Only Master on the Bus" option.
I downloaded the hwconfig and everything became OK! No BF and no SF flashing anymore!
Thanks for answers! :D
 
Another question:
Why we can not use HMI as slave? What is the usage of HMI objects in HWconfig? What if we want to add more HMI's or even CPU's?
 

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