Product Information: FLEX I/O and FLEX I/O-XT Modules

This document provides product information and original instructions for Allen-Bradley FLEX I/O and FLEX I/O-XT Modules.

Summary of Changes

This publication includes new or updated information, focusing on substantive updates. Changes include a new template with a multilingual block, updated certifications, added lower ratings for specific catalog numbers for ATEX/IECEx applications, and the addition of Electrical Safety Considerations.

Catalog Numbers Affected by ATEX/IECEx Rating Changes: 1794-TB2, 1794-TBN, 1794-TBNK, 1794-TB3, 1794-TB3K, 1794-TB3S, 1794-TB3SK, 1794-TB3T, 1794-TB3TK, 1794-TB3TS, and 1794-TB3TSK.

Note: Catalog numbers may be followed by a "K" to indicate a conformal coating option.

Important Safety Information

ATTENTION: Users must read this document and related installation, configuration, and operation documents before installing, configuring, operating, or maintaining the product. All activities, including installation, adjustments, and maintenance, must be performed by suitably trained personnel in accordance with applicable codes of practice. If the equipment malfunctions or is damaged, do not attempt repairs; return it to the manufacturer. Do not dismantle the module.

ATTENTION: Solid state equipment has different operational characteristics than electromechanical equipment. Refer to Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (publication SGI-1.1) for details on these differences.

IMPORTANT: Illustrations, charts, and examples in this publication are for illustrative purposes only. Rockwell Automation is not liable for actual use based on these examples due to the many variables in specific installations.

Environment and Enclosure

ATTENTION: This equipment is designed for use in a Pollution Degree 2 industrial environment, with overvoltage Category II applications (as defined in EN/IEC 60664-1), at altitudes up to 2000 m (6562 ft) without derating. It is not intended for residential environments.

This equipment is supplied as open-type for indoor use and must be mounted within an enclosure that is suitably designed for the specific environmental conditions and flame-retardant properties (e.g., 5VA flame spread rating or approved for nonmetallic applications). The enclosure interior should only be accessible with a tool.

Refer to Industrial Automation Wiring and Grounding Guidelines (publication 1770-4.1) and NEMA Standard 250 and EN/IEC 60529 for enclosure specifications.

European Hazardous Location Approval

This equipment is intended for use in potentially explosive atmospheres (Zone 2 classification) as defined by ATEX directive 2014/34/EU.

Key Approvals and Standards:

Equipment Group II, Category 3.
Type of protection: "Ex nA IIC T5 Gc", "Ex nA IIC T4 Gc", "Ex nA IIC T3 Gc", "Ex nA nC IIC T4 Gc", "Ex nA nC IIC T5 Gc" (according to EN 60079-15), or "Ex ec IIC T4 Gc", "Ex ec IIC T6 Gc" (according to EN 60079-7).
Compliance with Standards: EN 60079-0:2009, EN 60079-15:2010 (IECEx UL 14.0066X); EN IEC 60079-0: 2018, EN IEC 60079-7: 2015 +A1:2018 (UL 20 ATEX 2402X); EN 60079-0:2012+A11:2013, EN 60079-15:2010, EN 60079-7:2015 (DEMKO 14ATEX1342501X).

Special Conditions for Safe Use:

Mount in an ATEX/IECEx Zone 2 certified enclosure with a minimum IP54 rating.
Use in an environment not exceeding Pollution Degree 2.
Enclosure must be accessible only by tool.
Use within specified ratings.
Secure external connections.
Do not disconnect equipment unless power is removed or the area is non-hazardous.
Prevent rated voltage from being exceeded by transient disturbances (max 140% of rated voltage).
Use only with ATEX/IECEx certified Rockwell Automation backplanes.
Earthing is accomplished through mounting on rail.
Operating temperature ranges: -20...+55 °C, -20...+60 °C, -20...+70 °C, or -25...+70 °C.
Modules 1794-0W8 and 1794-0W8XT must be used at or below 60V AC.
Modules 1794-TB2, 1794-TBN, 1794-TBNK, 1794-TB3, 1794-TB3K, 1794-TB3S, 1794-TB3SK, 1794-TB3T, 1794-TB3TK, 1794-TB3TS, and 1794-TB3TSK must be used at or below 60V AC or 75V DC.

IEC Hazardous Location Approval

This equipment is intended for use in potentially explosive atmospheres (Zone 2 classification) according to IEC 60079-0.

Type of Protection: "Ex nA IIC T5 Gc", "Ex nA IIC T4 Gc", "Ex nA IIC T3 Gc", "Ex nA nC IIC T4 Gc" (according to IEC 60079-15), or "Ex ec IIC T4 Gc", "Ex ec IIC T6 Gc" (according to IEC 60079-7).

Electrical Safety Considerations

ATTENTION: Power for this equipment and connected I/O must be supplied from a source compliant with SELV or PELV standards (EN/IEC60950-1, EN/IEC61010-2-201, or EN/IEC62368-1 (ES1)). For U.S.A. or Canada system approval, a power source approved to the U.S.A. or Canadian version of these standards is required.

ATTENTION: All wiring must comply with applicable electrical installation requirements (e.g., N.E.C. article 501-4(b)).

ATTENTION: Wire conductor and insulation ratings must support a minimum temperature rating of 85 °C (185 °F).

Torque and Wire Size Specifications

Modules	Torque	Wire Size
FLEX I/O and FLEX I/O-XT™ modules (where applicable)	0.5...0.8 N-m (5...7 lb-in)	1.2 mm (3/64 in.) insulation max; 0.21...1.3 mm² (24...16 AWG) solid or stranded copper wire rated @ 115 °C (239 °F) or greater.

(1) See FLEX I/O Terminal Base Units Technical Data, publication 1794-TD019 for more information.

Prevent Electrostatic Discharge

ATTENTION: This equipment is sensitive to electrostatic discharge (ESD). Follow these guidelines to prevent damage:

Touch a grounded object to discharge static.
Wear an approved grounding wriststrap.
Do not touch connectors or pins on component boards.
Do not touch circuit components inside the equipment.
Use a static-safe workstation if available.
Store equipment in appropriate static-safe packaging when not in use.

Additional Resources

This section lists publications containing additional information on FLEX I/O, FLEX I/O-XT, and FLEX Ex™ modules and compatible control platforms. These include selection guides, technical data, and installation instructions for various module types.

Key Publications:

FLEX I/O Selection Guide (1794-SG002)
FLEX I/O Communication Adapters Specifications Technical Data (1794-TD014)
Industrial Automation Wiring and Grounding Guidelines (1770-4.1)
Product Certification website (rok.auto/certifications)
Publications download website (rok.auto/literature)

Rockwell Automation Support

Technical Support Center: rok.auto/support

Knowledgebase: rok.auto/knowledgebase

Local Technical Support Phone Numbers: rok.auto/phonesupport

Literature Library: rok.auto/literature

Product Compatibility and Download Center (PCDC): rok.auto/pcdc

Documentation Feedback: Submit suggestions via rok.auto/docfeedback.

Waste Electrical and Electronic Equipment (WEEE)

Dispose of this equipment responsibly at the end of its life, separate from unsorted municipal waste. For current product environmental compliance information, visit rok.auto/pec.

Contact Information

Rockwell Automation

AMERICAS: 1201 South Second Street, Milwaukee, WI 53204-2496 USA

EUROPE/MIDDLE EAST/AFRICA: Rockwell Automation NV, Pegasus Park, De Kleetlaan 12a, 1831 Diegem, Belgium

ASIA PACIFIC: Rockwell Automation, Level 14, Core F, Cyberport 3, 100 Cyberport Road, Hong Kong

Trademarks: Allen-Bradley, expanding human possibility, FactoryTalk, FLEX, FLEX Ex, FLEX I/O-XT, Rockwell Automation, and TechConnect are trademarks of Rockwell Automation, Inc. ControlNet, DeviceNet, and EtherNet/IP are trademarks of ODVA, Inc. Other trademarks are property of their respective companies.

	Allen-Bradley FLEX I/O Digital Input Modules Installation Guide Comprehensive guide for installing and configuring Allen-Bradley FLEX I/O Digital Input Modules (1794-IB8, 1794-IB16, 1794-IB32), covering safety, wiring, and technical specifications.
	FLEX I/O DeviceNet Adapter Modules Installation Instructions Installation instructions for FLEX I/O DeviceNet Adapter Modules, including catalog numbers 1794-ADN and 1794-ADNK, Series C. Covers environment, enclosure, electrostatic discharge prevention, hazardous location approvals, mounting, wiring, status indicators, firmware enhancements, and specifications.
	EtherNet/IP Network Configuration User Manual User manual for EtherNet/IP Network Configuration, detailing communication modules, CompactLogix controllers, adapters, and embedded switches. Note: This manual has been replaced by publication ENET-UM006.
	Micro800 Programmable Controller Family Selection Guide - Allen-Bradley Selection guide for Allen-Bradley Micro800 programmable controllers and Micro850 expansion I/O modules, detailing power requirements, specifications, and module types for industrial automation.
	SLC 500 Hardware Migration Guide: Upgrade to CompactLogix This guide provides comprehensive instructions for migrating from SLC 500 hardware to newer Allen-Bradley CompactLogix and Compact 5000 I/O systems. It covers controller and I/O module replacements, including wiring diagrams and software requirements for a smooth transition.
	Allen-Bradley PointMax XT 5034IF8VXT 8-Channel Analogue Input Voltage Module Datasheet Technical specifications and features of the Allen-Bradley PointMax XT 5034IF8VXT, an 8-channel analogue input voltage module for industrial I/O applications.
	Allen-Bradley 1762IF2OF2 MicroLogix Expansion Module Datasheet Technical specifications and overview of the Allen-Bradley 1762IF2OF2 MicroLogix Expansion Module, featuring 2 Analogue Inputs (AI) and 2 Analogue Outputs (AO) for 4-20mA and 0-10VDC signals.
	Allen-Bradley 1734IB4 Point I/O 4DI 24V DC Sink Module Datasheet Technical specifications for the Allen-Bradley 1734IB4 Point I/O 4DI 24V DC Sink Module, detailing electrical, construction, and environmental characteristics.