Allen-Bradley 1794-OB16P FLEX I/O 16Ch 24V Output Module

Overview

The Allen-Bradley 1794-OB16P is a FLEX I/O distributed digital output module designed for industrial control applications requiring compact, modular output expansion. It provides sixteen sourcing 24 V DC outputs with integrated electronic protection, enabling reliable control of field devices such as solenoids, indicators, and relay interfaces.

Output Configuration & Electrical Performance

• Output Type: 16-point sourcing DC outputs

• Rated Output Voltage: 24 V DC nominal (operating range 10–31.2 V DC)

• Maximum Output Current: Up to 8 A total module load

• Per Channel Current Limit: 500 mA maximum

• Voltage Drop (ON state): ≤ 0.5 V DC

• Leakage Current (OFF state): ≤ 0.5 mA

• Each channel includes electronic fuse protection for fault isolation

System Power & Consumption

• Backplane Current (FlexBus): 60 mA @ 5 V DC

• Power Dissipation: ~5.0 W @ 31.2 V DC

• Thermal Dissipation: ~17 BTU/hr

• Designed for low power loss in high-density distributed I/O systems

I/O Status & Diagnostics

• 16 independent channel status indicators (yellow LEDs)

• Real-time output state monitoring per channel

• Fault detection via electronic protection circuitry

• Supports rapid diagnostics for field wiring and load issues

Mounting & Compatibility

• Mounting Type: DIN rail installation

• Compatible Terminal Bases:

• 1794-TB2

• 1794-TB3

• 1794-TB3S

• 1794-TB3K

• Flexible wiring interface depending on selected terminal base

• Designed for modular FLEX I/O rack architecture

Environmental Ratings

• Operating Temperature: 0°C to 55°C

• Storage Temperature: -40°C to 85°C

• Vibration Resistance: 5 g (10–500 Hz)

• Shock Resistance: 30 g

• Isolation Voltage: 50 V continuous channel isolation

• Ingress Protection: IP20 (panel or enclosure installation required)

Mechanical Data

• Weight: 0.13 lbs

• Compact modular form factor for high-density DIN rail systems

• Designed for installation in control cabinets with FLEX I/O adapter systems

Engineering Notes

• Requires FLEX I/O adapter for communication with controller systems

• Outputs are sourcing type only; sinking loads require external configuration

• Electronic protection replaces traditional fusing for faster fault recovery

• Terminal base selection defines wiring topology and field connectivity

Applications

• Solenoid and valve control systems

• Industrial machine output expansion

• Indicator and signaling device control

• Distributed I/O architectures

• Packaging and material handling equipment

FAQ

Q1: Are the outputs individually protected?
Yes, each channel includes electronic fuse protection for overload conditions.

Q2: Can this module be used without a terminal base?
No, it must be installed on a compatible 1794 FLEX I/O terminal base.

Q3: Is this module suitable for outdoor use?
No, it is IP20 rated and requires installation inside a protective enclosure.