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- Allen Bradley
- 1746-OB8/A
- PLC Module/Rack
- USA
- 150 × 40 × 130 mm
- 0.4kg
- Xiamen, China
- New & In Stock
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Our products are imported in bulk from the place of origin. Because of the cooperative relationship, our products are all original and 100% new.
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We provide 7*24 hours service to our customers. We will be there whenever you need us.
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All our products are priced very favorably because we have our own warehouse and supply.
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Allen Bradley 1746-OB8/A — Detailed Technical Overview
1. Product Introduction
The Allen Bradley 1746-OB8/A is a digital DC output module designed for use within the SLC 500 PLC system. The “/A” revision indicates an early hardware version that has been widely deployed in industrial automation systems due to its stable performance and simple configuration.
This module provides eight sourcing DC output channels, enabling the PLC to control field devices that operate on DC voltage. It is typically used to drive solenoids, relays, indicator lamps, and other low-voltage DC loads.
The module integrates directly into the SLC 500 chassis and communicates with the controller through the backplane. Its solid-state transistor output design ensures fast switching speed and long operational life, making it suitable for continuous industrial use.
2. Product Parameters
Technical Specifications
| Parameter | Value |
|---|---|
| Model | 1746-OB8/A |
| Series | SLC 500 |
| Module Type | Digital DC Output Module (Sourcing) |
| Number of Outputs | 8 |
| Output Voltage Range | 10–50 V DC |
| Nominal Voltage | 24 V DC |
| Output Type | Transistor (sourcing) |
| Output Current per Point | Up to 1.0 A (30°C), 0.5 A (60°C) |
| Maximum Current per Module | Approx. 8 A |
| Surge Current | 3 A (10 ms) |
| On-State Voltage Drop | ≤ 1.2 V |
| Off-State Leakage Current | ≤ 1 mA |
| Minimum Load Current | ≥ 1 mA |
| Turn-On Delay | Approx. 0.1 ms |
| Turn-Off Delay | Approx. 1 ms |
| Backplane Current | Approx. 0.135 A @ 5V DC |
| Power Dissipation | Approx. 6–7 W |
| Isolation | Electrical isolation (field to backplane) |
| Status Indicators | 8 LEDs (per channel) |
| Operating Temperature | 0 to 60°C |
| Installation Type | Rack-mounted |
| Dimensions (mm) | 150 × 40 × 130 |
| Weight (kg) | 0.16 – 0.4 kg |
3. Product Applications
The 1746-OB8/A is widely used in industrial automation systems where DC output control is required.
Typical applications include:
- Driving solenoid valves and actuators
- Controlling relays and small DC motors
- Indicator lights and alarm systems
- Conveyor and packaging machinery
- General-purpose automation control systems
- Interface control between PLC and field devices
Its design is particularly suitable for applications requiring reliable switching of DC loads with moderate current requirements.
4. Product Advantages
Compact Output Configuration
Eight outputs provide a balanced solution for small to medium control systems.
Fast Switching Speed
Transistor-based outputs enable quick response times for dynamic control tasks.
Reliable Solid-State Design
No mechanical contacts, reducing wear and extending service life.
Wide Voltage Range
Supports 10–50V DC, allowing flexibility for various field devices.
Stable Industrial Performance
Designed for continuous operation in harsh industrial environments.
Clear Status Monitoring
LED indicators allow easy observation of output status.
Easy Integration
Seamlessly fits into SLC 500 racks with minimal configuration effort.
5. Brand Information
Allen Bradley is widely recognized in industrial automation for its PLC systems, I/O modules, and control solutions.
Its products are commonly used across manufacturing, energy, and infrastructure industries due to their durability and consistent performance.
6. Product Series
- Series Name: SLC 500
- Category: Digital Output Module (DC)
The SLC 500 series is a modular PLC platform designed for flexible system expansion and reliable control. It supports digital, analog, and specialty modules for a wide range of industrial applications.
7. Recommended Models (Same Series / Related)
Related Models Table
| Model | Function | Outputs | Signal Type | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|---|
| 1746-OB16 | Digital Output | 16 | 24V DC | 145 × 35 × 130 | 0.3 kg |
| 1746-OB32 | Digital Output | 32 | 24V DC | 248 × 173 × 58 | 0.35 kg |
| 1746-OV8 | Digital Output | 8 | 24V DC (sinking) | 145 × 35 × 130 | 0.3 kg |
| 1746-OW8 | Digital Output | 8 | Relay | 145 × 35 × 130 | 0.35 kg |
| 1746-OA8 | Digital Output | 8 | 120V AC | 145 × 35 × 130 | 0.3 kg |
8. Recommended Popular Models (Same Brand)
Popular Models Table
| Model | Series | Function | Type | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|---|
| 1756-OB16E | ControlLogix | Digital Output | 16-channel DC | 140 × 112 × 145 | 0.6 kg |
| 1756-OB32 | ControlLogix | Digital Output | 32-channel DC | 140 × 112 × 145 | 0.6 kg |
| 1769-OB16 | CompactLogix | Digital Output | 16-channel DC | 118 × 87 × 140 | 0.5 kg |
| 1769-OB32 | CompactLogix | Digital Output | 32-channel DC | 118 × 87 × 140 | 0.6 kg |
| 1606-XLS240E | Power Supply | DIN Rail PSU | 24V DC | 123 × 50 × 125 | 0.8 kg |