Allen Bradley 1794-OW8 Digital Output Module

The AB 1794-OW8 is an 8-channel relay output module from the FLEX I/O series, designed to switch DC loads using Form A (normally open) mechanical relay contacts. Each channel supports up to 2 A output, making this module ideal for actuating solenoids, relays, indicators, and other discrete field devices in low-voltage DC control systems.

Compatible with multiple FLEX I/O terminal bases—including TBNF, TBN, TB2, and TB3—the 1794-OW8 provides a flexible and compact distributed I/O solution with high-density relay switching capability. It is perfect for use in control systems where mechanical isolation and reliable switching are required.

Technical Specifications

Model: 1794OW8
Series: FLEX I/O
Type: Digital Relay Output Module
Output Channels: 8 relay outputs
Contact Type: Form A (SPST-NO) mechanical relays
Output Voltage Range: 24V DC
Application: General-purpose low-voltage DC relay control in distributed I/O systems
Terminal Base Compatibility: TBNF, TBN, TB2, TB3

Electrical Specifications

Permitted Output Voltage: 24 V DC
Max Output Current per Channel: 2 A
Total Module Output Current: 16 A (2 A x 8 channels)
Output Type: Relay – electromechanical contact
Short Circuit Protection: Not included (external protection required)
Leakage Current (Off-State): 0 mA
Minimum Load: 10 mA
Signal Delay (Typical): 10 ms ON / 10 ms OFF
Contact Life Expectancy: >100,000 operations at rated load
Dielectric Strength: 1500V AC channel-to-backplane isolation

Mechanical Specifications

Width: 94 mm
Height: 94 mm
Depth: 69 mm
Mounting Type: DIN rail via terminal base
Connection Type: Screw terminal (via base)
Weight: Approx. 200 g
Enclosure Type: IP20 (when mounted in enclosure)
Installation Orientation: Vertical recommended

Environmental Specifications

Operating Temperature: 0…55 °C
Storage Temperature: –40…85 °C
Relative Humidity: 5% to 95% non-condensing
Shock Resistance: 30 g, 11 ms (IEC 60068-2-27)
Vibration Resistance: 2 g, 10–500 Hz (IEC 60068-2-6)
Altitude Rating: Up to 2000 m
Pollution Degree: 2
Certifications: CE, UL, cULus, RoHS
Ingress Protection: IP20
Explosion Safety Classification: Not rated for gas or dust

Compliance & Communication

System Compatibility: FLEX I/O distributed I/O system
Protocol Support: Determined by selected FLEX I/O adapter (not integrated in module)
Diagnostics: Channel status via controller interface
Configuration Software: RSLogix 5000 / Studio 5000
I/O Mapping: Automatically configured by adapter
Fieldbus Integration: Requires adapter (EtherNet/IP, DeviceNet, ControlNet, etc.)

Key Features & Benefits

✅ 8 Relay Outputs (2A Each) – Provides mechanical switching for a range of DC field devices

✅ Screw Terminal Compatibility – Compatible with multiple FLEX I/O terminal bases

✅ Compact & Modular Design – Ideal for distributed I/O setups with limited space

✅ Channel-to-System Isolation – Ensures reliable operation with field device separation

✅ Simple Integration with FLEX I/O Adapters – Easily expands digital output capacity in Rockwell systems

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