Hi.

I have one tp270 and it communicates with s7-400 with direct key. 

The plc program is in step 7 v5.5

I need to change tp270 with tp1200 comfort. After changing it. Functions like reset fault buttons and some other functions that worked with direct key access doesnt work. And the bus fault led on my plc blinks. 

Should I configure the plc in tia for touch panel program?I mean I just trnasfre tp270 program from wincc flex to TIA. Should I configure plc s7-400 IN TIA and in there describe direct key? Because in step 7 v5.5 that the plc program was written, I couldnt find any thing for tp1200.

What should I do to fix the problem?

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Split from Link TP1200 with CPU315-2DP using simatic manager.