Allen-Bradley 5094 Flex 5000 I/O Modules – 5094-OB16

Technical Dossier

Product Details And Specifications

Allen-Bradley 5094 Flex 5000 Series Technical Notes

The Allen-Bradley Bulletin 5094 Flex 5000 I/O platform is a distributed I/O system engineered for integration with Logix 5000 controllers via EtherNet/IP. Deployed extensively across global heavy industry — including petrochemical complexes, nuclear power auxiliary systems, offshore oil & gas platforms, and continuous-process refineries — the 5094 series represents Rockwell Automation's current-generation modular I/O architecture. Its EtherNet/IP-native backplane eliminates the need for dedicated fieldbus adapters, enabling direct integration into PlantPAx DCS environments and standard Logix control architectures. The platform supports both standard and safety-rated modules within a unified mounting system, making it a preferred choice for greenfield installations and brownfield upgrades from legacy 1794 FLEX I/O and 1756 ControlLogix remote I/O racks.

The Evolution of 5094 Flex 5000 Architecture

Rockwell Automation introduced the Flex 5000 platform as the architectural successor to the 1794 FLEX I/O series, which had served distributed I/O applications since the mid-1990s. The 1794 platform relied on dedicated communication adapters (e.g., 1794-AENT, 1794-AENTR) to bridge fieldbus protocols to the backplane, creating a two-layer communication dependency. The 5094 architecture eliminates this by embedding EtherNet/IP communication natively into the adapter module, reducing latency and simplifying network topology.

Early 5094 releases (circa 2017–2019) focused on standard digital and analog I/O. Subsequent firmware revisions introduced CIP Safety-rated modules (5094-IB16S, 5094-OB8S), expanding the platform's applicability to SIL 2/PLe safety instrumented systems without requiring a separate safety I/O network. The platform's modular adapter design (5094-AENTR for redundant EtherNet/IP) also addressed high-availability requirements common in refinery and power generation environments. As of 2026, the 5094 series is in active production and represents Rockwell's primary recommendation for new distributed I/O deployments in Logix-based architectures.

5094 Flex 5000 Full Catalog & Functionalities (SKU List)

Digital Output Modules

5094-OB16: 16-point 24V DC sourcing digital output module, standard density, DIN rail mount.
5094-OB16S: 16-point 24V DC sourcing digital output, CIP Safety-rated, SIL 2 / PLe capable.
5094-OB8: 8-point 24V DC sourcing digital output module, high-current per point rating.
5094-OB8S: 8-point 24V DC sourcing digital output, CIP Safety-rated, dual-channel safety wiring.
5094-OW8I: 8-point relay output module, isolated contacts, 240V AC / 30V DC rated.

Digital Input Modules

5094-IB16: 16-point 24V DC sinking digital input module, standard density.
5094-IB16S: 16-point 24V DC sinking digital input, CIP Safety-rated, SIL 2 / PLe capable.
5094-IB8S: 8-point 24V DC sinking digital input, CIP Safety-rated, dual-channel configuration.
5094-IM8: 8-point 120V AC digital input module, for legacy AC field device integration.

Analog I/O Modules

5094-IF8: 8-channel analog input module, 4–20 mA / 0–10V configurable per channel, 16-bit resolution.
5094-IF8IH: 8-channel analog input, HART pass-through enabled, for smart field instrument integration.
5094-OF8: 8-channel analog output module, 4–20 mA / 0–10V configurable, 16-bit resolution.
5094-OF8IH: 8-channel analog output, HART pass-through enabled, for positioner and valve control loops.

Communication Adapters

5094-AENTR: Dual-port EtherNet/IP adapter with Device Level Ring (DLR) support, redundant media capability.
5094-AEN2TR: Dual-port EtherNet/IP adapter, extended temperature rating, for harsh environment enclosures.

Power Supplies

5094-PRG: 24V DC power supply module for Flex 5000 backplane, standard rail-mount configuration.
5094-PRGS: 24V DC power supply module, safety-rated, for use with CIP Safety module configurations.

Quality Control for the 5094 Flex 5000 Range

Each 5094 module processed through DriveKNMS undergoes a structured incoming inspection and functional verification protocol. Digital I/O modules are bench-tested using a Logix 5000 controller test rack with a 5094-AENTR adapter, verifying point-level I/O response, channel isolation integrity, and EtherNet/IP connection establishment. Analog modules are tested across the full 4–20 mA and 0–10V signal range using calibrated signal sources and loads, with resolution verification at 16-bit depth. HART-enabled modules (5094-IF8IH, 5094-OF8IH) are additionally tested for HART pass-through communication using a HART modem and field device simulator.

CIP Safety modules (5094-IB16S, 5094-OB16S, 5094-IB8S, 5094-OB8S) are inspected for firmware revision consistency and safety parameter integrity. Any module with a non-factory firmware state is quarantined and flagged for customer review prior to shipment. Backplane connector pins are inspected under magnification for deformation or corrosion. All tested units are issued a DriveKNMS inspection report documenting test date, firmware revision, and pass/fail status per channel.