Overview
The Allen-Bradley 1746-OA16 is a digital AC output module designed for the SLC 500 family of programmable controllers. This 16-point output module provides reliable triac switching for general-purpose industrial AC loads operating at 120/240 VAC. The module integrates seamlessly into local or remote I/O chassis, making it a drop-in solution for legacy control system upgrades and maintenance applications.
Key Features
- 16 discrete AC output points organized in two isolated groups of 8 channels each
- Two independent output commons reduce cross-channel interaction and provide greater wiring flexibility
- Removable terminal block design allows module swap without disconnecting field wiring
- Built-in filter circuitry and optical coupling for noise immunity in electrically noisy environments
- LED status indicators display real-time output state
- Fast response times: 1 ms ON delay, 11 ms OFF delay
Technical Specifications
- Output Type: AC Triac (digital)
- Number of Outputs: 16 points
- Output Voltage (Nominal): 120/240 VAC
- Operating Voltage Range: 85–265 VAC at 47–63 Hz
- Output Current per Channel: 0.5 A @ 30°C (86°F) / 0.25 A @ 60°C (140°F)
- Maximum Continuous Module Current: 8.0 A @ 30°C / 4.0 A @ 60°C
- Surge Current Capacity: 10.0 A per point for 25 ms (suitable for inductive loads)
- OFF-State Leakage Current: 2 mA maximum
- Minimum Load Current: 10 mA per channel
- On-State Voltage Drop: 1.5 V @ 0.5 A
- Signal Delay: 1 ms ON, 11 ms OFF (max resistive load)
- Backplane Current Consumption: 370 mA @ 5V DC
- Operating Temperature: 0–60°C (32–140°F)
- Relative Humidity: 5–95% noncondensing
- Memory Consumption: 16 bits of output image table
- Mounting: Single-slot I/O chassis module
Typical Applications
- Machine control and industrial automation systems
- HVAC control and heating/cooling applications
- Process control and sequential logic applications
- Motor pump and solenoid valve control
- Equipment status monitoring and indication
- Legacy SLC 500 system upgrades and field replacements
Compatibility & Replacements
Compatible With
- SLC 500 fixed processors (SLC 5/01, 5/02, 5/03, 5/04, 5/05)
- SLC 500 modular processors
- 1746 I/O chassis and remote I/O racks
- Remote I/O adapters and networks
- CompactLogix and ControlLogix systems via communication adapters
- Ladder logic programmed in RSLogix 500 or Studio 5000
Replaces / Drop-In Replacement For
- 1746-OA16 (all series revisions and date codes)
- Legacy applications using earlier 1746 AC output modules
- Note: Verify specific I/O rack compatibility and slot requirements before ordering
Works With
- RSLogix 500 ladder logic programming software
- Studio 5000 Logix Designer (with migration path)
- Allen-Bradley control platform and instruction set
- 1746 series peripheral modules (analog, digital, communication)
