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ControlLogix I/O

Bulletin 1756 ControlLogix I/O Chassis-Based

Bulletin 1756 ControlLogix® I/O modules provide a full range of digital, diagnostic digital, analog, motion control, and specialty I/O to meet your application needs. You can use any of the I/O modules in the local chassis of a ControlLogix controller or in a chassis linked to a ControlLogix controller across ControlNet™ or EtherNet/IP™ networks.

Conformal Coating Products Can Help Protect Your Automation Systems

Conformal coating is now available on select ControlLogix® products to help protect your automation systems from hostile and harsh environments. Rockwell Automation tested these products for the equivalent of 10 years in an ISA G3 Group A classified environment.

These products are identified by the "K" suffix in the catalog number and they: 

  • Help to protect circuitry against exposure to pollution, moisture, temperature variation, salt spray, organic attack (fungus), and aggressive chemicals and vapors.
  • Offer improved product life cycle when exposed to corrosive environments by maintaining long-term surface insulation resistance (SIR) ensuring operational integrity of the assembly.


  • Mounts in a ControlLogix® chassis
  • Requires either a removable terminal block (RTB) or a Bulletin 1492 wiring interface module (IFM) to connect all field-side wiring
  • Inherent time-stamping capabilities for sequence of events (SOE) applications
  • Comprehensive I/O diagnostics for detection of both system and field-side failures
  • Removal and insertion under power (RIUP) for ease of maintenance
  • Electronic keying to help prevent replacement errors
  • I/O wizards in the Studio 5000™ Logix Designer application enable quick and easy module configuration


1756 ControlLogix Digital I/O Modules

  • Variety of voltages
  • 8 to 32 points per module
  • Isolated and nonisolated module types
  • Point-level output fault states
  • Direct-connect or rack-optimized communication
  • Field-side diagnostics on select modules

1756 ControlLogix Analog I/O Modules

  • Input, output, and combination modules
  • Thermocouple and RTD modules
  • On-board data alarming
  • Scaling to engineering units
  • Real-time channel sampling
  • Electronic module keying, software configurable
  • Mechanical RTB keying, user-defined

1756 ControlLogix Specialty I/O Modules

  • Configurable flow meter modules
  • High-speed counter modules
  • Programmable limit switch modules

1756 ControlLogix Removable Terminal Blocks (RTBs)

  • Provide a flexible interconnection between plant wiring and I/O modules
  • Screw-clamp or spring-clamp terminations
  • Not shipped with I/O modules; you must order separately


  • c-UL-us, CE, CSA, C-Tick, FM, ATEX, TÜV

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

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Rockwell Automation Integrated Architecture Solutions provide the foundation to drive plantwide optimization efficiently and effectively, enabling you to respond competitively to the economy and changes in consumer demand.

Related Products


Use the Studio 5000 Automation Engineering and Design environment to design and configure your ControlLogix® system.

The controllers and modules you select, along with your network configuration, determine which additional software packages you need to configure and program your system. Additional required software may include:

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Additional software products are available from Rockwell Software.

Frequently Viewed Publications

Integrated Architecture BrochureIA-BR005
Extreme Environment (XT) System Product ProfileXT-PP001
ControlLogix Peer-to-Peer I/O Product Profile1756-PP018
ControlLogix System Selection Guide1756-SG001
ControlLogix I/O Modules Technical Data1756-TD002
ControlLogix Digital I/O Modules User Manual1756-UM058
ControlLogix Analog I/O Modules User Manual1756-UM009
More 1756 ControlLogix I/O Module publications in Literature LibraryAll Languages

Product Catalog

Find catalog numbers, certifications, and specifications.


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

Can’t Find What You Need?

Browse our Literature Library where you can search for additional publications in more languages. You can also use the Advanced Search feature to search by catalog number, publication type, title, or keywords to narrow your results.

Build This Catalog Number

Build or verify a catalog number, and get information and CAD drawings for these products.

Configuration & Selection Tools

Other Resources

  • Electronic Data Sheets — Find DeviceNet™, ControlNet™, EtherNet/IP™, and network-independent EDS files.
  • Knowledgebase — Visit our online resource for technical information, support chat and forums, software updates, and product safety advisories/notices.


We offer a variety of accessories for your ControlLogix® I/O modules, including: 

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