FLEX Ex I/O Power Supplies

Bulletin 1797 FLEX Ex™ power supplies provide power for the FLEX Ex ControlNet™ Ex network, communication adapter, I/O modules, fiber hub, and intrinsic safety (IS) field devices. No other power sources are needed to operate any Components attached to the FLEX Ex system in the hazardous area. Power for valves, actuators, or transmitters comes from the FLEX Ex modules.


  • Isolates unsafe incoming power from the control system and limits the available energy to IS-safe levels
  • Supplies power for the FLEX Ex™ I/O system
  • AC or DC versions
  • N-Type explosion-proof enclosure includes 1-inch conduit pipe thread input/output terminations
  • E-Type flame-proof enclosure includes increased safety input/output terminations
  • Free-standing, saving cabinet space


  • 1797 FLEX Ex 85...253V AC Power Supplies
  • 1797 FLEX Ex 24V DC Power Supplies


  • FLEX Ex I/O modules are rated for installation in:
  • Class I Division 1 & 2, Groups A-D hazardous areas
  • North American Class I Zone 1 & 2, Groups IIC, IIB, & IIA hazardous areas
  • European Zones 1, 2, and 22
  • FLEX Ex I/O modules are rated for connection to:
  • Field devices located in Class I, II, or III, Groups A-G hazardous areas
  • Devices in Class II or III locations
  • Field devices located in North American Class I Zone 0, 1, & 2, Groups IIC, IIB, & IIA hazardous areas
  • Field devices located in European Zones 0, 1, 2, 21, and 22 hazardous areas
  • FLEX Ex power supplies are rated for use in Zones 1 and 22