Hello guys,
we've got Stama Robodrill MC14 with Fanuc16i and intermittent errors 1018 (TCZ switch is welding) and 1016 (MCC is deffective).

When I'm looking at alarm 1018 in ladder I see it misses one condition to activate which is R0301.2 to become active.
When I look at this R0301.2 coil I see following line (rung) which puzzles me... How can contact R0301.2 activate itself after timer value expires?
https://ibb.co/9qPMYVt

What really causes R0301.2 coil to activate to 1, actually what causes timer to start counting?
What is the difference between R0301.2 contact (condition to start timing) and R0301.2 coil?
Isn't R0301.2 just bit number 2 of memory address R0301?

Thanks in advance for anything useful in understanding this logic.