Ok thanks for response,
I read in beckhoff doc about the blinking err code I had:
I have 4 pulses and as argument (second sequence) 1 pulse, meaning second module(0 is first)?
Im not sure what break behind terminal means.
(bk52x0en.pdf)
Thanks very much, your answer helped, I played around a bit with removing I/O modules and adding, it works fine now.