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- Allen Bradley
- 1746-OA8/A
- PLC Module/Rack
- USA
- 145 × 35 × 130 mm
- 0.4kg
- Xiamen, China
- New & In Stock
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Allen Bradley 1746-OA8/A — Detailed Technical Overview
1. Product Introduction
The Allen Bradley 1746-OA8/A is a digital AC output module designed for use within the SLC 500 PLC platform. The “/A” revision represents an early hardware version that has been widely used in industrial systems due to its stability and straightforward functionality.
This module provides eight discrete AC output channels, allowing the PLC to control field devices that operate on AC voltage. Typical loads include pilot lights, relays, contactors, and small motors. Each output channel is designed to switch AC loads reliably while maintaining electrical isolation between the control system and field devices.
The module is installed directly into the SLC 500 chassis and communicates with the processor via the backplane. It uses solid-state switching technology, which improves durability and reduces mechanical wear compared to relay-based outputs.
2. Product Parameters
Technical Specifications
| Parameter | Value |
|---|---|
| Model | 1746-OA8/A |
| Series | SLC 500 |
| Module Type | Digital AC Output Module |
| Number of Outputs | 8 |
| Output Voltage Type | AC |
| Nominal Output Voltage | 120 V AC |
| Voltage Range | 85–132 V AC |
| Frequency | 47–63 Hz |
| Output Type | Triac (solid-state) |
| Continuous Current per Output | Approx. 0.5 A |
| Maximum Current per Module | Approx. 4 A |
| Surge Current | Up to 5 A (short duration) |
| Minimum Load Current | Approx. 10 mA |
| Leakage Current | Approx. 2–3 mA |
| Turn-On Time | < 1 ms |
| Turn-Off Time | < 10 ms |
| Backplane Current | Approx. 0.085 A @ 5V DC |
| Power Dissipation | Approx. 6–8 W |
| Isolation | Optical isolation (field to logic) |
| Status Indicators | 8 LEDs (one per output) |
| Operating Temperature | 0 to 60°C |
| Installation Type | Rack-mounted |
| Dimensions (mm) | 145 × 35 × 130 |
| Weight (kg) | 0.3 – 0.4 kg |
3. Product Applications
The 1746-OA8/A is widely used in industrial automation systems where AC-powered devices must be controlled directly by the PLC.
Typical applications include:
- Switching pilot lights and indicator lamps
- Controlling relays and contactors
- Operating solenoids and small AC loads
- Conveyor and packaging systems
- Industrial machinery control panels
- General-purpose discrete AC output control
It is particularly suitable for applications where reliable and fast switching of AC loads is required.
4. Product Advantages
AC Load Compatibility
Designed specifically for 120V AC outputs, ensuring compatibility with common industrial devices.
Solid-State Reliability
Triac-based outputs provide long life and eliminate mechanical wear.
Compact Design
Eight outputs in a single module optimize panel space usage.
Fast Switching Performance
Quick response times improve system efficiency in dynamic operations.
Electrical Isolation
Protects the PLC and control circuits from field-side disturbances.
Easy Diagnostics
LED indicators provide clear visibility of output status.
Proven Stability
The /A revision is widely deployed and known for consistent operation.
5. Brand Information
Allen Bradley is widely recognized in industrial automation for producing PLC systems, I/O modules, and control equipment.
Its products are commonly used in manufacturing, process control, and infrastructure systems due to their durability and consistent performance.
6. Product Series
- Series Name: SLC 500
- Category: Digital Output Module (AC)
The SLC 500 series is a modular PLC platform that supports a wide range of digital, analog, and specialty modules. It allows flexible configuration and reliable operation in industrial control systems.
7. Recommended Models (Same Series / Related)
Related Models Table
| Model | Function | Outputs | Signal Type | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|---|
| 1746-OA16 | Digital Output | 16 | 120V AC | 145 × 35 × 130 | 0.35 kg |
| 1746-OW16 | Digital Output | 16 | Relay | 145 × 35 × 130 | 0.4 kg |
| 1746-OB16 | Digital Output | 16 | 24V DC | 145 × 35 × 130 | 0.3 kg |
| 1746-OA8 | Digital Output | 8 | 120V AC | 145 × 35 × 130 | 0.3 kg |
| 1746-OW8 | Digital Output | 8 | Relay | 145 × 35 × 130 | 0.35 kg |
8. Recommended Popular Models (Same Brand)
Popular Models Table
| Model | Series | Function | Type | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|---|
| 1756-OA16 | ControlLogix | Digital Output | 120V AC | 140 × 112 × 145 | 0.6 kg |
| 1756-OB16E | ControlLogix | Digital Output | 24V DC | 140 × 112 × 145 | 0.6 kg |
| 1769-OA16 | CompactLogix | Digital Output | 120V AC | 118 × 87 × 140 | 0.5 kg |
| 1769-OW16 | CompactLogix | Digital Output | Relay | 118 × 87 × 140 | 0.5 kg |
| 1606-XLS240E | Power Supply | DIN Rail PSU | 24V DC | 123 × 50 × 125 | 0.8 kg |