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FLEX I/O Modules

Bulletin 1794 FLEX I/O In-Cabinet Modules

Bulletin 1794 FLEX™ I/O offers flexibility for your application with digital, analog, HART analog, and specialty I/O, with 4…32 points per module. You can mix and match digital and analog I/O with mounting and wiring options.


  • Digital and analog modules plus a breadth of specialty modules support a wide variety of applications
  • Removal and Insertion Under Power (RIUP) lets you replace modules and make cable connections while the system is in operation
  • FLEX-I/O XT™ extreme environment modules are rated for -20...70 °C (-4....185 °F) and are compatible with the ControlLogix-XT™ extreme environment system
  • Conformal coated modules are available
  • Each I/O module requires a terminal base for connection points for I/O wiring


1794 FLEX™ I/O Digital Modules

  • Cover a wide electrical range
  • Densities range from 8…32 points
  • Isolated inputs or outputs, protected outputs, electronic fusing, or diagnostics available on some modules

1794 FLEX I/O Analog Modules

  • Individually configurable channels
  • Selectable input filters on many modules
  • Single-ended or differential inputs
  • On-board scaling
  • Internal calibration
  • Thermocouple, RTD, and HART (Highway Addressable Remote Transmitter) modules available

1794 FLEX I/O Specialty Modules

  • Frequency modules
  • Very High Speed counter module
  • Pulse counter modules


  • UL; UL Class I, Div 2; CE; CE / ATEX, CSA Class I, Div 2; C-Tick, Marine certification, SIL 2

Certifications apply when product is marked. See our Product Certification site for Declarations of Conformity, certificates and other certification details.

Learn More

Our Extreme Environment (XT) system [PDF] includes control, communication, and distributed I/O products that extend the benefits of the Rockwell Automation Integrated Architecture to applications with more demanding environmental conditions.

Related Products

Frequently Viewed Publications

FLEX I/O and FLEX I/O XT Product Profile1794-PP019
Extreme Environment (XT) System Product ProfileXT-PP001
FLEX I/O and FLEX Ex I/O Selection Guide1794-SG002
FLEX I/O Analog Modules User Manual1794-UM002
FLEX I/O Analog Isolated Modules User Manual1794-UM008
FLEX I/O Diagnostic Modules User Manual1794-UM061
FLEX I/O Frequency Input Module User Manual1794-UM011
FLEX I/O HART Modules User Manual1794-UM063
FLEX I/O HART Isolated Modules User Manual1794-UM065
FLEX I/O Pulse Counter User Manual1794-UM016
FLEX I/O Thermocouple/Millivolt Module User Manual1794-UM007
More 1794 FLEX I/O publications in Literature LibraryAll Languages

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See our Product Certification site for Declarations of Conformity, certificates and other certification details.

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We offer a variety of accessories for your FLEX I/O™ Modules, including:

  • Cold junction compensation kit
  • DIN rail locks
  • Distribution boards
  • Extender cables
  • Filler module
  • Label kit
  • Panel mounting kit
  • Terminal bases

View all FLEX I/O Module accessories

I/O Wiring Accessories

Our I/O wiring and conversion systems provide faster installation, fewer wiring errors, and simplified troubleshooting for your Allen-Bradley® I/O.

  • Interface modules (IFMs, AI FMs), pre-wired cables, and ready-to-wire cables replace terminal blocks, reducing point-to-point wiring
  • IFMs let you add terminations, status indicators, and over-current protection for your I/O