Overview
The Allen-Bradley 1771-OWNA is a specialized contact output module designed for PLC-5 controllers. This digital I/O module features 32 non-selectable normally-open contacts organized into four groups of eight outputs each. The 1771-OWNA uses electromechanical relays, making it an essential component for controlling electrical devices in factory automation, motor control, and equipment sequencing applications. The module installs directly into Allen-Bradley 1771 I/O chassis systems and operates reliably across a wide voltage range.
Key Features
- 32 non-selectable normally-open contacts for straightforward output control
- Voltage rating of 24 to 138 Volts AC RMS and 24 to 125 Volts DC
- Maximum current output of 1 Amp per output with defined thermal derating curves
- 32 outputs organized into 4 groups of 8 for flexible load distribution
- Electromechanical relay construction for proven durability in industrial environments
- Minimum contact load of 10 milliamps ensures compatibility with sensitive control circuits
Technical Specifications
- Output Channels: 32 non-selectable normally-open contacts
- Output Configuration: 4 groups of 8 outputs
- AC Voltage Rating: 24 to 138 Volts AC RMS
- DC Voltage Rating: 24 to 125 Volts DC
- Output Current per Channel: 1 Amp continuous (with derating above 45°C)
- Module Maximum Current: 12 Amps total module rating
- Group Current Limit: 4 Amps per group of 8 outputs
- Power Rating per Output: 30 Watts maximum
- Minimum Contact Load: 10 milliamps
- Operating Temperature: 32 to 140 degrees Fahrenheit
- Relay Type: Electromechanical
- Mounting: Slots A1B to A4B of 1771 chassis
- Max Interconnect Cable Length: 1000 feet
- Backplane Current Rating: 1.8 A nominal, 2.5 A maximum
Typical Applications
The 1771-OWNA output module is ideal for:
- PLC-5 process automation and control systems requiring discrete relay outputs
- Motor control and equipment sequencing in manufacturing environments
- Alarm annunciation and solenoid valve control circuits
- Fan, pump, and compressor control in HVAC and industrial systems
- Machine tool control and conveyor belt automation
- Facilities where normally-open relay contacts are preferred for fail-safe logic design
Compatibility & Replacements
Compatible With
- Allen-Bradley PLC-5 controllers
- 1771 Universal I/O Chassis (1771-A1B, 1771-A2B, 1771-A3B, 1771-A4B)
- 1771 family I/O modules and processors
- Legacy Allen-Bradley automation systems using 1771 backplane architecture
- Field wiring arm: 1771-WN terminal connection system
Replaces / Drop-In Replacement For
The 1771-OWNA directly replaces OEM modules with matching catalog number and revision level. For exact interchangeability, verify compatibility with your system integrator before ordering, as revision levels may affect pinout or electrical specifications.
Works With
- Allen-Bradley RSLogix 5 software for PLC-5 programming and monitoring
- 1771 I/O chassis management and configuration tools
- Standard industrial relay wiring practices (24-138V AC/DC environments)
- Rockwell Automation control system integration platforms
