1 NB Overview 1-2 Part Names and Functions 1-2 Part Names and Functions This section describes the names and functions of each part of the NB Unit. z NB3Q-TW00B/NB3Q-TW01B model Front view 1 Power Indicator Display Back view : NB -TW01B only Confirm the safety of the system before turning ON or OFF the power supply, or pressing the reset button. NB-series Programmable Terminals Startup Guide Manual(V109) 1-3 Precautions for Safe Use