The production line was currently at stand still and without operating current so it had none of the outputs on. I asked when was the line running last and it was hour ago, so I assumed there has to be working program in the memory.
The PLC card has a RAM card installed, no EEPROM, so I checked the system manual of s5-135u and if I understand correctly DB's and DX's locate on RAM. Only idea I have is that STEP5 showed me the blocks from RAM card.