Overview
The Allen-Bradley 1794-OA16 is a discrete AC digital output module in the FLEX I/O family, manufactured by Rockwell Automation. This 16-point 120VAC output module provides reliable control of AC-powered field devices in distributed I/O systems. The module features non-isolated output channels with a 4.0-ampere rating and operates across a 74–132 VAC range, making it suitable for relay coils, solenoid actuators, contactors, pilot lamps, and industrial signaling devices.
Key Features
- 16 non-isolated AC output channels rated at 4.0 amperes per module
- Output voltage range: 74–132 VAC, 47–63 Hz (nominal 120VAC)
- On-state voltage drop: 1.5V maximum at 0.5A
- Built-in 2.5A internal fuse for overall module protection
- Maximum output signal delay: ½ cycle (OFF-to-ON and ON-to-OFF transitions)
- Compatible with all 1794 FLEX I/O terminal bases and communication adapters
- DIN-rail mountable with modular terminal base architecture
- CSA, CUL, UL, CE, C-Tick, KC, GOST certified
Technical Specifications
- Output Points: 16 digital AC outputs (non-isolated)
- Output Voltage (Nominal): 120VAC
- Output Voltage Range: 74–132 VAC at 47–63 Hz
- Output Current Rating: 4.0 amperes (maximum per module)
- Per-Channel Current: 5.0 mA minimum on-state, 500 mA maximum at 55°C
- On-State Voltage Drop: 1.5V maximum at 0.5A
- Off-State Leakage: 2.25 mA maximum
- Surge Current Rating: 7A for 40 ms (repeatable every 8 seconds)
- Output Signal Delay: ½ cycle maximum for ON/OFF transitions
- Internal Fuse: 2.5A, 150V AC, normal blow (MQ2)
- FlexBus Current: 80 mA @ 5V DC
- Power Dissipation: 4.7W maximum @ 0.5A
- Operating Temperature: 0 to 55°C (32 to 131°F), 5–95% non-condensing humidity
- Storage Temperature: -40 to 85°C (-40 to 185°F)
- Dimensions: 94 × 94 × 69 mm (3.7 × 3.7 × 2.7 inches)
- Weight: Approximately 96 grams (3.38 ounces)
- Vibration Resistance: 5G at 10–500 Hz
- Shock Rating: 30G operating, 50G non-operating
- ESD Immunity: 8 kV air discharge
- Dielectric Strength: 2,150V DC between system and user circuits for 1 second
- Mounting: DIN-rail or panel mount via compatible terminal base
Typical Applications
- Energizing AC relay coils and contactor coils in remote or distributed I/O cabinets
- Solenoid actuation and valve control in hydraulic and pneumatic systems
- Pilot light and indicator lamp control circuits
- Industrial alarm and signaling devices (horn, siren, buzzer circuits)
- Load-shedding and motor starter control in distributed factory automation
- Motor control center (MCC) and switchgear integration for remote shutdown sequences
Compatibility & Replacements
Compatible With
- All Allen-Bradley 1794 FLEX I/O communication adapters (DeviceNet, EtherNet/IP, ProfiNet, ASI, etc.)
- All 1794 FLEX I/O terminal bases: 1794-TBN, 1794-TBNF, 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBKD, 1794-TBNK, 1794-TBNFK, 1794-TB3K, 1794-TB3SK
- Rockwell Automation controllers using distributed FLEX I/O architecture (ControlLogix, CompactLogix, etc.)
- Studio 5000 and legacy RSLogix 5000 programming environments
- Industrial networks supporting 1794 FLEX I/O I/O modules
Replaces / Drop-In Replacement For
- Previous revisions of the Allen-Bradley 1794-OA16 (same part number across firmware revisions)
- Similar 16-point AC output modules within the legacy FLEX I/O discrete output category
- Note: Modern replacement is the 5094-OA16 (CompactLogix-era FLEX I/O output module)
Works With
- Software Platforms: Studio 5000, RSLogix 5000, FactoryTalk View HMI
- Communication Protocols: EtherNet/IP, DeviceNet, PROFINET, ASI, CC-Link over appropriate 1794 adapter modules
- Terminal Wiring: Screw-clamp terminal connections via associated terminal base units
- Power & Control: 120VAC field power supply (customer-provided) and 5VDC FlexBus logic power (from adapter module)
