Overview
The Allen-Bradley 1794-OB16 is a discrete 24VDC sourcing output module designed for FLEX I/O distributed I/O systems. This 16-point module provides current sourcing outputs for controlling industrial loads, actuators, and field devices in automation and process control applications. With a compact design and DIN-rail mounting, the 1794-OB16 delivers reliable digital switching performance across a wide voltage range (19.2–31.2V DC) and operates within the full industrial temperature spectrum.
Key Features
- 16 discrete sourcing outputs – Each channel rated at 0.5A with 8A total current capacity
- 24VDC nominal operation – Accepts 19.2–31.2V DC input (5% AC ripple allowed)
- Fast response time – 0.5 ms off-to-on, 1 ms on-to-off output signal delay
- DIN-rail and panel mount – Flexible mounting options for cabinet installations
- 16 yellow status LEDs – Field-side indication of output channel status
- Industrial-grade certifications – UL, CSA, CUL, CE, GOST, KC, MARINE, C-TICK approved
Technical Specifications
- Output Configuration: 16 channels, non-isolated, sourcing
- Nominal Voltage: 24V DC
- Voltage Range: 10–31.2V DC on-state
- Output Current per Channel: 0.5A maximum, 1 mA minimum
- Total Current Rating: 8.0A
- On-State Voltage Drop: 0.5V DC maximum
- Off-State Leakage Current: 0.5 mA maximum
- Module Supply Current: 49 mA @ 24V DC (38–65 mA range)
- FlexBus Current: 80 mA @ 5V DC; 5.3W max power dissipation @ 31.2V DC
- Thermal Dissipation: 18.1 BTU/hour
- Response Time: 0.5 ms (off-to-on), 1 ms (on-to-off)
- Operating Temperature: −4 to +131°F (0–55°C)
- Dimensions: 3.7 × 3.7 × 2.7 inches
- Weight: 78 grams (0.15 lbs)
- Enclosure: Open-style (IP20)
- Terminal Connection: Screw terminal (base-dependent)
Typical Applications
- Discrete load switching (solenoids, contactors, relays)
- Actuator control in automated machinery
- Pilot light and indicator lamp drivers
- Conveyor and motion control systems
- HVAC and process equipment switching
- Distributed I/O in manufacturing and assembly lines
Compatibility & Replacements
Compatible With
- 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3K, 1794-TB3SK terminal base units
- All 1794 FLEX I/O adapters for distributed I/O networks
- Allen-Bradley CompactLogix and ControlLogix systems via FLEX I/O interface
- EtherNet/IP and other industrial networks (via compatible gateway modules)
- Studio 5000 and RSLogix 5000 programming environments
Replaces / Drop-In Replacement For
- 1794-OB16/A (equivalent with revision suffix)
- Legacy 1794-OB8 systems when requiring 16-point capacity (requires terminal base swap)
Works With
- Studio 5000 Logix Designer
- RSLogix 5000
- FLEX I/O distributed I/O architecture and messaging protocols
- EtherNet/IP adapters and gateways
- Industrial automation control networks compatible with Allen-Bradley FLEX I/O I/O modules
