Overview
The Allen-Bradley 1771-OVN is a DC-powered sink output module engineered for industrial automation and process control. This module is part of the Allen-Bradley PLC-5 and Bulletin 1771 series, providing discrete output switching in manufacturing and facility control environments. Configured with 32 sinking outputs divided into four isolated groups of eight channels, the module is suitable for interfacing with field devices such as relays, pilot lamps, solenoids, and low-voltage DC actuators.
Key Features
- 32 discrete outputs organized in 4 groups of 8 outputs each
- Voltage rating of 10 to 32 Volts DC with operating range of 10 to 30 Volts DC
- Low-true logic for field signal operation
- Maximum on-state voltage drop of 1.5V DC at rated output current
- Conformal coating protection for improved resistance against moisture and industrial contaminants
- Compatible with both local and remote I/O chassis environments and rack-mounted PLC-5 architectures
Technical Specifications
- Output Channels: 32 (4 isolated groups × 8 outputs)
- Output Voltage Range: 10 to 30 VDC
- Voltage Rating: 10 to 32 VDC
- Output Current: 0.5 A per output (max); 8 A per module total
- Backplane Current: 330 mA maximum from power supply via backplane
- On-State Voltage Drop: 1.5V DC maximum at rated output current
- Logic Type: Low-true DC sink
- Addressing Support: 1-slot addressing with restrictions and half-slot addressing with no restrictions; does not support 2-slot addressing
- Deployment: Local or remote processor systems
- Weight: 370 grams
- Manufacturing: Made in Malaysia
Typical Applications
The 1771-OVN is widely used in process control, machine automation, and building management systems where discrete DC switching is required. Typical applications include solenoid valve actuation, pilot light control, relay coil switching, and low-voltage motor control circuits. It is particularly suited for retrofit installations in existing PLC-5 automation systems and OEM panel integration.
Compatibility & Replacements
Compatible With
- 1771 I/O chassis: 1771-A1B, 1771-A2B, 1771-A3B, 1771-A3B1, 1771-A4B, or later
- Allen-Bradley PLC-5 processors
- Bulletin 1771 automation control systems
- Local chassis installations and remote I/O configurations
- 1771-WH terminal wiring arm (recommended)
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The 1771-OVN is a standard module within the Bulletin 1771 output module family; earlier or later revisions may have different addressing or performance characteristics.
Works With
- PLC-5 ladder logic and structured text programming
- Allen-Bradley programming software (RSLogix, Studio 5000)
- Discrete DC control circuits (24V to 30V)
- Standard PLC-5 backplane communication
- Industrial solenoids, relays, and pilot light circuits
