FLEX Ex I/O Communication Interfaces

Use the Bulletin 1797 FLEX Ex™ communication module and FLEX Ex I/O installed in the hazardous area to gather data at its origin and transport it to the safe area with minimal wiring. ControlNet™ Ex connectivity leverages the diagnostic capabilities and determinism of the ControlNet network for intrinsic safety (IS) applications. FLEX Ex is also compatible with standard FLEX™ I/O communication modules for connectivity to DeviceNet™, Universal Remote I/O, and EtherNet/IP™ networks.


  • Provides ControlNet™ Ex network connectivity for the hazardous area
  • Supports up to eight I/O modules for a maximum of 128 I/O points
  • Includes built-in power supply
  • You can isolate ControlNet segments in the hazardous and safe areas using the 1797 ControlNet Ex Coax-to-Fiber Media Port Adapter or the 1797 Coax Barrier
  • Additional Communication Options
  • You can use 1794 FLEX™ I/O communication interfaces in a FLEX Ex system for connectivity to standard ControlNet, DeviceNet™, Universal Remote I/O, and EtherNet/IP™ networks
  • This option requires use of the 1797 Bus Isolator Pair


  • 1797 ConrtrolNet Ex Communication Interface