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- Allen Bradley
- 1746-OB8
- PLC Module/Rack
- USA
- 145 × 35 × 140 mm
- 0.39kg
- Xiamen, China
- New & In Stock
- T/T, PayPal, Western Union
- 1 Year
- 1-3 Working Days
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Global Logistics
We have a 10-year logistics and express cooperation agreement, so our products can be shipped to any place in the world.
Brand new and original
Our products are imported in bulk from the place of origin. Because of the cooperative relationship, our products are all original and 100% new.
24-hour service
We provide 7*24 hours service to our customers. We will be there whenever you need us.
Price advantage
All our products are priced very favorably because we have our own warehouse and supply.
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Allen-Bradley 1746-OB8 Detailed Technical Overview
1. Product Overview
The Allen-Bradley 1746-OB8 is an 8-point DC digital output module used in the SLC 500 PLC system. It is designed to control 24V DC field devices such as relays, solenoid valves, indicator lamps, and small actuators.
This module belongs to the standard SLC 500 discrete output family and provides reliable transistor-based switching for industrial automation systems. Each output channel is independently controlled by the PLC processor, allowing precise and flexible machine control.
The 1746-OB8 is widely used in compact control systems where a small number of DC outputs is required with stable performance.
2. Brand Information
- Brand: Allen-Bradley
- Industry: Industrial automation and PLC systems
- Product Type: DC digital output module
The brand is widely recognized for durable PLC hardware used in manufacturing, process control, and factory automation systems.
3. Product Series
- Series: SLC 500
- Category: Digital output module
- Type: DC transistor output module
The SLC 500 system is a modular PLC platform. The 1746-OB8 is part of its compact output module range designed for efficient DC load control.
4. Technical Parameters
Core Specifications Table
| Parameter | Value |
|---|---|
| Model | 1746-OB8 |
| Module Type | DC Digital Output |
| Series | SLC 500 |
| Number of Outputs | 8 |
| Output Type | Sinking transistor (DC) |
| Output Voltage Range | 10–50 V DC |
| Nominal Voltage | 24 V DC |
| Output Current per Point | 1.0 A @ 30°C / 0.5 A @ 60°C |
| Output Current per Module | 8.0 A max |
| Surge Current | 3.0 A for 10 ms |
| Switching Device | Transistor |
| Turn-On Time | ~0.1–1 ms |
| Turn-Off Time | ~1–2.5 ms |
| Backplane Current (5V) | 135 mA |
| Backplane Current (24V) | 0 mA |
| On-State Voltage Drop | ~1.2 V @ 1 A |
| Off-State Leakage Current | ≤1 mA |
| Heat Dissipation | ~6.9 W total |
| Load Type | DC resistive / inductive loads |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Relative Humidity | 5–95% non-condensing |
| Dimensions (mm) | 145 × 35 × 140 |
| Weight (kg) | ~0.39 kg |
5. Product Functions and Applications
Functional Description
- Converts PLC logic signals into DC switching outputs
- Controls external 24V DC industrial devices
- Provides fast electronic switching with no mechanical wear
- Supports inductive load switching with surge handling capability
- Enables compact multi-channel control in PLC systems
Typical Applications
- Industrial automation production lines
- Conveyor and packaging machinery
- Solenoid valve actuation systems
- Relay and contactor control circuits
- Alarm and indicator lamp systems
- General-purpose DC device switching
6. Product Advantages
1. Fast Switching Response
Electronic transistor switching provides millisecond-level response for precise control.
2. Compact Design
Eight-channel structure reduces PLC rack space requirements.
3. Stable Industrial Performance
Designed for continuous operation in harsh industrial environments.
4. Strong Load Handling Capability
Supports 1A per channel and surge current for inductive loads.
5. Simple Integration
Direct compatibility with SLC 500 systems without additional configuration.
7. Recommended Models (Same Series or Related)
SLC 500 Series Related Modules
| Model | Type | Channels | Signal Type | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|---|
| 1746-OB16 | DC Output | 16 | 24V DC | 145 × 35 × 140 | 0.34 |
| 1746-OB16E | DC Output | 16 | Sourcing | 145 × 35 × 140 | 0.35 |
| 1746-OB32 | DC Output | 32 | 24V DC | 145 × 35 × 140 | 0.36 |
| 1746-OA8 | AC Output | 8 | 120/240 VAC | 129 × 35 × 118 | 0.44 |
| 1746-OW8 | Relay Output | 8 | AC/DC Relay | 145 × 35 × 140 | 0.40 |
8. Recommended Popular Models (Same Brand)
Popular Automation Modules
| Model | Type | Channels | Voltage | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|---|
| 1756-L73 | Controller | — | 5V DC | 150 × 140 × 130 | 0.36 |
| 1769-L36ERM | Compact Controller | — | 24V DC | 120 × 90 × 70 | 0.30 |
| 1734-IE8C | Analog Input | 8 | 4–20 mA | 75 × 12 × 60 | 0.16 |
| 1769-OF8C | Analog Output | 8 | 0–10 V | 118 × 87 × 35 | 0.30 |
| 1756-EN2T | Ethernet Module | — | 5V DC | 150 × 140 × 130 | 0.32 |