The 1797-PS2N was designed and produced by Allen-Bradley and is a power supply unit. Allen-Bradley designed this unit to operate with FLEX Ex systems. This unit isolates and controls, as well as limits, incoming power in order to optimize it for use by FLEX Ex systems and it is used by the FLEX Ex system to exclusively supply power to its components in hazardous environments, while FLEX Ex modules are used to supply power to the system's other components such as valves, actuators, and transmitters.

The power supply unit is designed with a twenty-four (24) volts direct current (DC) in and quad-Ex direct current (DC) out configuration. This Allen-Bradley module is also includes four (4) channels with eight-point-five (8.5) watts of power output per channel and dual power supply feeds for source input redundancy. Furthermore, each output is IS-isolated, and each channel is IS-limited separately. Additionally, the electricity being supplied is protected by a safety enclosure with a one (1)-inch conduit pipe thread and input and output terminations.

The 1797-PS2N power supply unit requires three-point-one (3.1) amperes of current for input and is rated for a power dissipation of twenty-one (21) watts. furthermore, the thermal dissipation for this unit is rated at 71.67 British Thermal Unit per hour (BTU/hr). Input power is accepted at a range of nineteen (19) to thirty-two (32) volts with a five percent (5%) alternating current (AC) ripple tolerance. Moreover, the input power is rated at fifty-five (55) watts. This Allen-Bradley unit is certified to offer IP66 and NEMA 7B protection. This module has an approximate weight of 7.3 kilograms, or the equivalent of 16 pounds. The physical dimensions of this power supply unit measure 174 mm x 174 mm x 128 mm.