Overview
The Allen-Bradley 1746-OA16 is a digital AC output module designed specifically for the SLC500 family of programmable logic controllers. This 16-point output module provides reliable control signals to field devices operating on 120/240V AC, such as motor starters, contactors, and indicator lights. Each output channel sends individually controlled ON/OFF signals based on your PLC program, with built-in optical isolation for enhanced reliability in industrial environments.
Key Features
- 16 AC output channels divided into two isolated groups of eight
- Supports 120/240V AC control voltages within operating range of 85–265V AC
- Removable terminal block connectors with screw-type wiring for fast installation and module swapping
- Single-slot form factor occupies minimal chassis space
- Optical isolation and surge protection for dependable industrial performance
- Series B, C, and D compatibility across SLC500 ecosystem
Technical Specifications
The 1746-OA16 module is built to exacting industrial standards and integrates seamlessly into any SLC500 I/O chassis configuration.
- Output Type: Digital AC, TRIAC-based switching
- Output Voltage: 120/240V AC nominal; operates 85–265V AC (47–63 Hz)
- Rated Current per Output: 0.5A @ 30°C; 0.25A @ 60°C
- Maximum Continuous Current per Output: 8.0A @ 30°C; 4.0A @ 60°C
- Backplane Current Consumption: 370 mA @ 5V DC
- Signal Delay: 1 ms ON; 11 ms OFF (max)
- Off-State Leakage: 2 mA maximum
- Output Memory: 16 bits consumed in controller image table
- Minimum Load Current: 10 mA per output
- Certifications: UL 508 listed, CSA 22.2 142 approved, Class I Division 2
- Connector: Removable terminal block (RTB) with screw terminals
- Points per Common: 8 outputs per isolated group
Typical Applications
The 1746-OA16 is used across a broad range of industrial automation tasks including material handling, HVAC control, high-speed assembly operations, and small process control. Its two isolated output groups provide flexibility for distributing loads and managing panel wiring. The module simplifies integration into legacy SLC500 systems while maintaining cost efficiency and saving valuable panel real estate in larger installations.
Compatibility & Replacements
Compatible With
- SLC500 family controllers (fixed and modular processors)
- SLC500 local and remote I/O chassis
- CompactLogix and ControlLogix systems via communication adapters
- Any SLC500-based automation application requiring AC output control
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The 1746-OA16 Series C is compatible with Series B and D versions in similar applications, but direct replacement compatibility depends on your specific wiring and load configuration.
Works With
- Allen-Bradley RSLogix 500 programming software
- SLC500 processor firmware and instruction sets
- Automation Terminal Blocks (1492-series cables and interface modules)
- Standard industrial 120/240V AC power distribution networks
- Inductive and resistive loads with surge suppression where required
