Overview
The Allen-Bradley 1794-OB16 is a 16-point digital output module designed for Flex I/O distributed I/O systems. This sourcing-style output module provides 16 non-isolated, 24VDC current-source channels configured for controlling solenoids, relays, contactors, indicator lights, and small motor starters. The module mounts directly on a 1794 terminal base unit and integrates seamlessly into CompactLogic and in-cabinet automation architectures.
Key Features
- 16 sourcing outputs — 8A total module capacity (0.5A per channel, 2A surge per channel for 50ms)
- Fast response time — 0.5ms off-to-on switching, 1ms on-to-off switching for time-critical applications
- Wide operating range — 10–31.2V DC on-state voltage with 0.5V drop per output
- External 24VDC power requirement — Accepts 18–31.2V DC input with low Flexbus current draw (80mA max at 5VDC)
- Status indicators — 16 yellow LED indicators for real-time output status monitoring
- Industrial certifications — UL, CSA, CE, CUL, GOST, KC, and marine-grade approvals
Technical Specifications
Operating voltage range: 10–31.2V DC on-state (sourcing); external 24V DC supply required. Each output supports 1mA–500mA continuous per channel, with maximum module current of 8A total. Surge capability rated at 2A per channel for 50ms, repeatable every 2 seconds. Off-state leakage current: 0.5mA maximum. Signal switching delay: 0.5ms (off-to-on) and 1.0ms (on-to-off). Power consumption: 5.3W at maximum (31.2V DC). Module dimensions and weight are compact for DIN-rail or panel mounting in open-style enclosures. Operating temperature range: 32–131°F (0–55°C).
Typical Applications
- Industrial process control: solenoid and contactor switching
- Discrete machine automation: indicator light control and relay driving
- Distributed I/O for remote panel operations
- Motor starter and pump control via pilot lines
- CSA-approved hazardous location installations (where certified)
Compatibility & Replacements
Compatible With
- 1794 Flex I/O terminal base units (1794-TB3, 1794-TB3S)
- Allen-Bradley CompactLogic controllers and distributed I/O architectures
- EtherNet/IP via 1794-AENT or similar Flex I/O adapters
- PROFINET and Modbus adapters for Flex I/O integration
Replaces / Drop-In Replacement For
The 1794-OB16 directly replaces earlier revisions of the same model number. Verify compatibility with your existing Flex I/O configuration before ordering; contact your system integrator if swapping legacy modules.
Works With
- Allen-Bradley Studio 5000 (Logix Designer) programming environment
- RSLinx and RSLogix 5000 legacy environments
- EtherNet/IP, PROFINET, and Modbus communication protocols (via Flex I/O adapters)
- Flex I/O diagnostic tools and configuration utilities
