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Help CenterAllen-Bradley 1746-OB8 is a SLC 500 Digital DC Output Module
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As a reliable supplier in the industrial automation sector since 2011, Rossonix Co., Limited is proud to offer genuine Allen-Bradley components like the 1746-OB8 module. We understand that the backbone of any efficient production line is reliable control hardware. This SLC 500 Digital DC Output Module is engineered to provide dependable switching for your actuators, solenoids, and indicators, ensuring your automated processes run smoothly and predictably. With our extensive experience serving global markets from North America to Oceania, we provide not just a product, but a solution backed by consistent quality and support.
The Allen-Bradley 1746-OB8 is a critical component for expanding the control capabilities of your SLC 500 programmable logic controller (PLC) system. It serves as the vital interface between your controller's logic and the physical devices in your factory. When your PLC program determines an output needs to be activated, this module reliably switches the DC power to the connected load.
Core Features & Technical Advantages:
High-Density Design: Incorporates 8 independent output points on a single module, optimizing rack space within the SLC 500 chassis for cost-effective system expansion.
Robust Sinking Outputs: Configured as sinking (negative logic) outputs, where the module provides the path to ground. This is a common and reliable configuration for driving a wide array of industrial DC devices.
Solid-State Reliability: Utilizes solid-state switching technology (typically opto-isolated triacs or transistors), offering faster switching speeds, longer service life, and silent operation compared to electromechanical relays.
Wide Voltage Compatibility: Designed to operate with a broad range of DC supply voltages from 10 to 30 VDC, providing flexibility for integration into various plant power standards.
Individual Point Protection: Each of the 8 output channels is typically fused or protected against short-circuit conditions, helping to prevent a fault on one device from disabling the entire module.
Status Indication: Features LED indicators for each output channel, providing immediate visual confirmation of the output's ON/OFF state for easy troubleshooting and maintenance.
Key Specifications:
| Parameter | Specification |
| Catalog Number | 1746-OB8 |
| Module Type | Digital DC Output |
| Number of Outputs | 8 (isolated in groups) |
| Output Current (per point max) | 2.0 A @ 30°C |
| Output Voltage Range | 10 - 30 VDC |
| On-State Voltage Drop (typ.) | |
| Off-State Leakage Current | |
| Backplane Current Load (5V) | 0.15 A (typical) |
Benefits for Your Operation:
Enhanced System Uptime: The proven reliability of Allen-Bradley hardware minimizes unplanned downtime, keeping your production lines running and meeting output targets.
Simplified Maintenance & Troubleshooting: Clear per-point LED indicators allow technicians to quickly identify the status of connected devices, reducing mean time to repair (MTTR).
Design Flexibility: The wide operating voltage range allows integration into systems with 12VDC, 24VDC, or other standard DC supplies commonly found in industrial settings.
Protection for Your Investment: Short-circuit and overload protection on outputs helps safeguard both the module and the more expensive connected field devices from damage due to wiring errors or device failures.
Seamless Integration: As a native Allen-Bradley module, it is fully recognized and easily configured within Rockwell Automation programming software like RSLogix 500, ensuring quick commissioning.
Frequently Asked Questions (FAQ):
Q: Is the 1746-OB8 a sinking or sourcing output module?
A: The 1746-OB8 is a sinking output module. This means the output point acts as a switch to ground (common negative). The positive side of your DC load should be connected to the positive DC supply voltage.Q: What is the maximum load I can connect to each output?
A: Each output point can handle a maximum continuous current of 2.0 Amps at an ambient temperature of 30°C. The current rating may need to be derated at higher operating temperatures. Always consult the official datasheet for specific derating curves.Q: Can I use this module to control AC loads?
A: No, the 1746-OB8 is designed specifically for Direct Current (DC) loads within the 10-30 VDC range. Using it with AC voltage will damage the module. For AC loads, you would need a corresponding AC output module like the 1746-OA8.Q: How do I wire the field devices to this module?
A: Wiring is done to the removable terminal block on the front of the module. You will connect your DC power supply positive to one side of your load (e.g., a solenoid coil). The other side of the load connects to the module's output terminal. The module's common terminal(s) are then connected to the negative side of the same DC power supply.Q: Is this module compatible with all SLC 500 processors?
A: The 1746-OB8 is compatible with the entire SLC 500 fixed and modular controller family. It can be used in any SLC 5/01, SLC 5/02, SLC 5/03, SLC 5/04, or SLC 5/05 processor system, provided there is an available slot in the chassis.Q: What is the isolation rating between output points?
A: Outputs on the 1746-OB8 are typically isolated in groups (e.g., 4 points per common). The exact grouping and isolation voltage should be verified in the product's technical data sheet, which is available upon request.Q: Do you provide any warranty or technical support for this module?
A: As a supplier, we ensure the module is genuine and in new or like-new working condition. While the original manufacturer's warranty may be time-expired, we stand by the quality of our products. Basic technical documentation and integration guidance can be provided to support your installation.
Choosing Rossonix means partnering with a supplier that has built a reputation over more than a decade, handling an annual export value in the multi-million dollar range and serving a diverse clientele across six continents. Our operations from Shenzhen and Hong Kong allow for efficient logistics to key global markets. We source our Allen-Bradley inventory with diligence to ensure authenticity and performance. For your next project requiring robust and reliable PLC output control, the 1746-OB8 represents a smart, proven choice. Contact us today to discuss your requirements, check stock availability, or request a competitive quotation for this essential industrial automation component.
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