electrical panels and plc panels

[omsumitam]

Hi, i am dealing with PlC panels and taking f/b from some electrical panels ,for this i am getting some problems in terminals block details ,

 

[omsumitam]

like trip f/b ,on/off f/b ,etc

 

[keithkyll]

I assume f/b means feedback. If an overload is tripped, a f/b contact will send a signal to a PLC input so the PLC knows the overload tripped.
For on/off, this would be a spare contact on the on/off relay.