Allen-Bradley Allen-Bradley Home
Bulletin 1756 ControlLogix Extreme Environment Programmable Automation Controllers

ControlLogix Extreme Environment Controllers

Bulletin 1756 ControlLogix-XT™ Extreme Environment Controllers function in the same way and offer the same features as the ControlLogix Standard Controllers. The XT controllers leverage the Rockwell Automation® Integrated Archi­tecture™ control engine with enhancements to meet the needs of extreme environment applications, including conformal coating that extends product life in harsh, corrosive environments. In addition, an XT control system spaces modules in every other slot for thermal cushion and offers redesigned ventilation for increased air flow.

  • Overview
  • Software
  • Documentation
  • Resources
  • Applications


  • Provide twice the processing speed in the L7 models when compared to the L6 models
  • Operate in environments with -20...70 °C (-4...158 °F) temperature range when used with FLEX™ I/O-XT modules
  • Designed for environments with -25...70 °C (-13...158 °F) temperature range
  • Support Integrated Motion on EtherNet/IP™, integrated Sercos™ motion, and analog motion
  • Support full controller redundancy
  • Support removal and insertion under power (RIUP)
  • Communicate via EtherNet/IP, ControlNet™, DeviceNet™, Data Highway Plus™, Remote I/O, SynchLink, and third-party process and device networks
  • Let you program using relay ladder logic, structured text, function block, and SFC languages
  • Offer flexible user memory options


  • 1756 ControlLogix-XT™ Controllers, L7 and L6 models

ControlLogix-XT Controller Comparison

FeatureL7 ModelsL6 Models
Performance Capability Twice the performance of L6 models High
Max. Controller Connections 500 250
Built-in Port USB Serial
Energy Storage Module (ESM) Included Yes No
Battery Required No Yes
On-board Display Included Yes No
Supported in Studio 5000™ Environment Yes No
Non-volatile Memory Secure Digital card CompactFlash card
Max. User Memory 32 MB 32 MB
Max. I/O Points 128,000 digital; 4,000 analog 128,000 digital; 4,000 analog
I/O Module Integration 1756 ControlLogix I/O 1756 ControlLogix I/O


  • ControlLogix-XT Controllers: c-UL-us, CE, C-Tick, ATEX, KC

Learn More

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.

Our Corporate Responsibility Report outlines our progress on the corporate responsibility issues most relevant to our business, customers and employees.


Use RSLogix 5000 programming software (L6 models) or the Studio 5000 Automation Engineering and Design environment (L7 models) from Rockwell Software® to design and configure your ControlLogix® system.

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

Learn More

Additional software products are available from Rockwell Software.


Integrated Architecture BrochureIA-BR005
Extreme Environment System Product ProfileXT-PP001
ControlLogix Redundancy Product Profile1756-PP017
ControlLogix Selection Guide1756-SG001
ControlLogix Controllers Specifications Technical Data1756-TD001
ControlLogix System User Manual1756-UM001
ControlLogix Enhanced Redundancy System User Manual1756-UM535
Logix5000 Controllers Common Procedures Programming Manual1756-PM001
Logix5000 Controllers Design Considerations Reference Manual1756-RM094
More ControlLogix XT publications in Literature LibraryAll Languages
More ControlLogix publications in Literature LibraryAll Languages

Product Catalog

Find catalog numbers, certifications, and specifications.

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.

Product Certifications

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

Build This Catalog Number

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

Configuration & Selection Tools

Other Resources

  • Drives and Motion Accelerator Toolkit — Use selection tools, layout & wiring drawings, and HMI files to design, install, operate, and maintain a Rockwell Automation® drive system.
  • EtherNet/IP Capacity Tool — Calculate resources used by a proposed EtherNet/IP™ network.
  • Firmware Updates — Log in to get support for firmware updates.
  • Logix Designer Start Page — Use these videos (formerly RSLogix™ 5000 Start Pages) to quickly learn important tasks in Studio 5000™ Logix Designer application.
  • PLC-5/SLC Interactive Migration Tool — Migrate your PLC-5 or SLC system to a Logix-based solution using products such as the I/O Wiring Conversion System.
  • Software Updates — Log in to get support for software updates.
  • Knowledgebase — Visit our online resource for technical information, support chat and forums, software updates, and product safety advisories/notices.


Our Extreme Environment (XT) system, which includes ControlLogix-XT™ controllers and chassis, communication, and distributed I/O products, is designed to operate in the most rigorous environmental conditions, providing reliable control in caustic atmospheres with severe temperature fluctuations and volatile weather patterns. The Logix XT system eliminates the need for additional heating/cooling equipment, resulting in lower installation and maintenance costs, smaller panel footprint, and reduced energy consumption. Typical applications include:

  • Energy & Power Generation
  • Food & Beverage; Dairy
  • Mining & Metals
  • On-ship
  • Pulp & Paper
  • Railway/Subway & On-vehicle
  • Water/Wastewater

Customer Success