Allen-Bradley FLEX I/O Modules: 1794-IB16XT,

Name: Allen-Bradley FLEX I/O Modules: 1794-IB16XT,
Brand: Allen-Bradley

Model: 1794-IB16XT

Brand Allen-Bradley

Series FLEX

Model 1794-IB16XT

RFQ-ready model route Obsolete and surplus sourcing Export follow-up by model list

Product Overview

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Technical Dossier

Product Details And Specifications

Allen-Bradley FLEX I/O Series Technical Notes

The 1794-IB16XT, the subject of this page, is a 16-channel digital DC input module rated for extended temperature operation (-20°C to +60°C), designed for installations in uncontrolled or harsh ambient environments where standard-range modules are not rated for use.

The Evolution of FLEX I/O Architecture

The FLEX I/O platform was introduced in the mid-1990s as Rockwell Automation's answer to the demand for distributed, rack-independent I/O that could be mounted close to field devices, reducing wiring runs and cabinet footprint. The original 1794 series communicated via the 1794-ADN DeviceNet Adapter, positioning it within Allen-Bradley's DeviceNet ecosystem alongside the SLC 500 and early ControlLogix controllers.

As fieldbus standards evolved, Rockwell expanded the adapter portfolio to include ControlNet (1794-ACN/ACNR), EtherNet/IP (1794-AENT/AENTR), PROFIBUS DP (1794-APB), and Remote I/O (1794-ASB). This multi-network compatibility allowed the same physical I/O modules to be reused across different communication backbones, protecting capital investment during control system migrations.

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A: Quantity, required condition, documentation needs, destination and sourcing route are confirmed during RFQ review before quotation.

FLEX I/O Full Catalog & Functionalities (SKU List)

Digital Input Modules (DI)

1794-IB16: 16-channel 24VDC sink digital input, standard temperature range
1794-IB16XT: 16-channel 24VDC sink digital input, extended temperature (-20°C to +60°C)
1794-IB32: 32-channel 24VDC sink digital input, high-density configuration
1794-IM8: 8-channel 120VAC digital input module for legacy AC field devices
1794-IV16: 16-channel 24VDC source (IEC Type 1) digital input module

Digital Output Modules (DO)

1794-OB16: 16-channel 24VDC source digital output, 0.5A per channel
1794-OB16XT: 16-channel 24VDC source digital output, extended temperature
1794-OB32: 32-channel 24VDC source digital output, high-density
1794-OW8: 8-channel relay output module, Form A contacts, 2A per channel
1794-OA8: 8-channel 120/240VAC triac output module

Analog Input/Output Modules (AI/AO)

1794-IE8: 8-channel analog current input, 4–20mA, 12-bit resolution
1794-IE8XT: 8-channel analog current input, extended temperature variant
1794-OE4: 4-channel analog current output, 4–20mA, 12-bit resolution
1794-IF4I: 4-channel isolated analog input, voltage/current selectable
1794-OF4I: 4-channel isolated analog output, voltage/current selectable

Communication Adapters

1794-AENT: EtherNet/IP adapter, single-port, supports up to 8 I/O modules per bank
1794-AENTR: EtherNet/IP adapter with embedded DLR switch for ring topology redundancy
1794-ACN15: ControlNet adapter, coax media, supports scheduled and unscheduled messaging
1794-ADN: DeviceNet adapter, supports explicit and I/O messaging
1794-APB: PROFIBUS DP adapter, slave mode, up to 244 bytes I/O

Power Supplies & Terminal Bases

1794-TB3: 3-wire terminal base for standard I/O modules
1794-TB3S: 3-wire terminal base with side-mount wiring
1794-PS13: 24VDC power supply module for FLEX I/O bank

Sourcing Hard-to-Find & Obsolete FLEX I/O Parts

A significant portion of the 1794 FLEX I/O catalog has transitioned to RFQ availability review or end-of-life status as Rockwell Automation shifts its installed base toward the FLEX 5000 (5094) platform. For end users operating continuous-process facilities — where a control system migration is a multi-year capital project — the ability to source replacement 1794 modules on demand is a direct operational requirement.

Quality Control for the FLEX I/O Range

FLEX I/O modules present specific verification challenges due to their backplane bus interface and terminal base dependency. A module that passes basic power-on self-test may still exhibit communication faults when installed in a live bank due to degraded backplane connectors, corrupted firmware, or failed internal bus transceivers.

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