Allen-Bradley 5094-OW8I FLEX 5000 8-Point Output Module for Hazardous Environments

Brand Allen-Bradley

Model Allen-Bradley 5094-OW8I FLEX 5000 8-Point

Product Overview

The ALLEN-BRADLEY 5094-OW8I is an 8-point digital relay output module within the FLEX 5000 I/O platform, a flexible and modular distributed I/O system designed for use with Logix5000 controllers including ControlLogix 5580, CompactLogix 5380, and GuardLogix 5580 families . As an isolated relay output module, the ALLEN-BRADLEY 5094-OW8I provides dry contact outputs capable of switching both AC and DC loads, making it a versatile solution for applications requiring electrical isolation between the control system and field devices. The module occupies a single slot in a FLEX 5000 terminal base assembly and communicates with the controller via an EtherNet/IP adapter using the producer/consumer communication model .

Each of the eight output channels on the ALLEN-BRADLEY 5094-OW8I is electrically isolated from the system power bus and from one another, eliminating ground loops and reducing the risk of electrical interference that can affect measurement accuracy or cause spurious operations. The relay outputs are rated for 2 A per channel at both 5-30V DC and 5-240V AC, enabling direct control of a wide range of field devices including solenoid valves, contactors, indicator lamps, and small motors without requiring interposing relays . The module supports Removal and Insertion Under Power (RIUP), allowing replacement while the system remains operational, which is critical for maintaining availability in continuous process applications .

The ALLEN-BRADLEY 5094-OW8I is configured using Studio 5000 Logix Designer software, with individual output points programmable for specific states during program mode and communication fault conditions . Each output features status indicators that provide visual confirmation of channel operation, with yellow and red LEDs indicating normal and fault conditions respectively. The module operates across an extended temperature range of -40°C to 70°C and carries certifications for use in hazardous locations including Class I, Division 2, Zone 2 environments .

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	ALLEN-BRADLEY 5094-OW8I
Manufacturer	Allen-Bradley (Rockwell Automation)
Product Type	Digital 8-Point Isolated Relay Output Module
Product Line	FLEX 5000 I/O
Number of Outputs	8 isolated relay outputs
Output Type	Normally open relay, dry contact
Output Voltage Range (AC)	5…240 V AC
Output Voltage Range (DC)	5…125 V DC
Output Current Rating	2 A per channel (resistive)
Output Delay Time (Max)	10 ms (Off to On and On to Off)
Initial Contact Resistance	30 mΩ maximum
Off-State Leakage	0 mA (dry contact, no onboard snubbers)
Isolation	System-side to field-side power bus
Terminal Connection	Screw connection
Mounting	FLEX 5000 terminal base (sold separately)
Operating Temperature	-40°C to +70°C
Dimensions (H × W × D)	68.57 × 94 × 49.75 mm
Weight	0.20 kg (0.44 lbs)

Main Features and Advantages

Isolated Relay Outputs for Electrical Noise Immunity: The ALLEN-BRADLEY 5094-OW8I provides true electrical isolation between each output channel and the system backplane, as well as between individual channels. This isolation prevents ground loops and electrical noise from field wiring from propagating into the control system, ensuring reliable operation even in electrically noisy industrial environments. The dry contact configuration means the outputs introduce no leakage current in the off state, making the module suitable for applications where even minimal leakage could cause false activation of sensitive field devices .

Wide AC/DC Voltage Compatibility: Unlike solid-state output modules limited to specific voltage ranges, the ALLEN-BRADLEY 5094-OW8I relay outputs can switch both AC and DC loads across an exceptionally wide range—from 5 to 240 V AC and 5 to 125 V DC . This flexibility allows a single module type to serve diverse field device requirements, simplifying spare parts inventory and reducing the need to maintain multiple output module variants for different voltage applications.

Removal and Insertion Under Power (RIUP): The ALLEN-BRADLEY 5094-OW8I supports hot-swap replacement, enabling maintenance personnel to remove and replace the module while the FLEX 5000 system remains powered and operational . This capability minimizes downtime in continuous process industries where even brief interruptions to monitoring or control can have significant production or safety consequences. The module’s latching mechanism and keying ensure proper alignment and prevent incorrect installation in the terminal base.

Configurable Fault and Program Mode States: Each output point on the ALLEN-BRADLEY 5094-OW8I can be independently configured to assume a specific state during program mode and communication fault conditions. Options include Hold Last State, On, or Off, with the default being Off for safety . The module also supports configurable fault mode durations of 1, 2, 5, or 10 seconds, or Forever, giving engineers precise control over how outputs behave when the controller enters a fault state.