Home / ABB / ABB Drives / ABB AC Drives / ABB ACS880 Drive / ABB ACS880 Drive Options Code / ABB ACS880 Drive +L502 FEN-31 1 input Optional Code/Module ((HTL pulse encoder), 1 output)ABB ACS880 Drive +L502 FEN-31 1 input Optional Code/Module ((HTL pulse encoder), 1 output)