Allen Bradley 1794-OB8EP Digital Output Module

The AB 1794-OB8EP is an 8-point digital output module in the FLEX I/O series, designed for 24V DC sourcing applications. Featuring integrated electronic fusing, this module offers advanced protection for downstream devices and simplifies fault diagnostics, making it ideal for distributed control systems where space-saving and high reliability are essential.

Engineered to support sourcing output configurations, the 1794-OB8EP integrates seamlessly into Rockwell Automation’s FLEX I/O architecture and supports terminal bases such as TB2, TB3, TB3S, and TBN.

Technical Specifications

Model: 1794OB8EP
Series: FLEX I/O
Type: Digital Output Module
Channels: 8 sourcing outputs
Output Type: Electronic fused, 24V DC source
Terminal Base Compatibility: TB2, TB3, TB3S, TBN
Application: Industrial automation, actuator control, PLC-based output systems

Electrical Specifications

Rated Output Voltage: 24 V DC
Permitted Output Voltage Range: 24…24 V
Output Current per Channel: Up to 2 A
Output Configuration: Sourcing (positive logic)
Short-Circuit Protection: Yes – electronic fuse
Overload Protection: Yes
Output Delay (Signal Change): <1 ms typical
Electronic Fusing: Per channel protection
Input Channels: 0
Galvanic Isolation: Channel-to-backplane isolation
Current Limiting: Enabled for device protection

Mechanical Specifications

Width: 94 mm
Height: 94 mm
Depth: 69 mm
Mounting Type: DIN rail (via terminal base)
Connection Type: Screw terminals
Module Type: Plug-in
Front Installation: Not supported
Enclosure Rating: IP20
Weight: Approx. 130 g

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 (when properly enclosed)

Compliance & Communication

System Compatibility: FLEX I/O
Communication Protocol: Depends on installed network adapter
Diagnostics: Short-circuit and overload detection
Configuration: Via Studio 5000 / RSLogix 5000
Status Indicators: LED for each output
Backplane Communication: Through terminal base adapter
Field Power Supply: 24V DC nominal

Key Features & Benefits

✅ 8 x 24V DC Sourcing Outputs – Ideal for controlling relays, solenoids, and actuators in industrial systems

✅ Electronic Fuse Protection – Enhances safety with resettable overload protection on each output channel

✅ Compact FLEX I/O Format – Optimized for distributed control systems with limited space

✅ Terminal Base Flexibility – Supports TB2, TB3, TB3S, and TBN for installation adaptability

✅ Fast Response Time – Sub-millisecond switching speed for high-performance applications

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