Description
Product Name: 1746-RL51 Allen Braley Input module
Product details:
The Allen-Bradley 1746-RL51 is a specialized hardware component within the SLC 500 modular hardware platform. Specifically, it is a Relay Output Module Replacement Terminal Block or a related relay-based accessory designed for the SLC 500 series.
Below is a detailed breakdown of the product specifications, advantages, and application guidelines.
1. Product Overview
The 1746-RL51 is part of the SLC 500 family from Rockwell Automation. It typically functions as a Replacement Relay or a specialized Terminal Block assembly for 1746 series output modules (like the 1746-OW16). It ensures that the high-current switching capabilities of the PLC remain reliable by providing a modular way to maintain the relay contacts.
2. Technical Specifications
While specific electrical ratings can vary based on the host module it is installed in, the general parameters for this series are:
| Parameter | Specification |
| Series | SLC 500 Modular I/O |
| Component Type | Relay Replacement / Terminal Assembly |
| Operating Voltage | 5–125V DC / 5–265V AC |
| Contact Type | Normally Open (N.O.) – Form A |
| Backplane Current Load | Dependent on host module (e.g., 1746-OW16) |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Isolation | 1500V AC (between contacts and backplane) |
3. Product Advantages
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Modular Maintenance: Allows for the replacement of specific relay components without needing to replace the entire I/O module, significantly reducing downtime and costs.
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High Versatility: Capable of handling both AC and DC loads, making it suitable for diverse industrial environments.
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Rugged Design: Built to withstand industrial electrical noise and physical vibration common in manufacturing plants.
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Ease of Installation: Designed for “snap-in” compatibility with the SLC 500 chassis systems.
4. Key Considerations & Safety (Precautions)
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Power Down: Always remove power from the SLC 500 chassis and the field-side devices before installing or replacing the 1746-RL51.
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Load Suppression: When switching inductive loads (like motors or solenoids), use external surge suppressors (RC networks for AC, diodes for DC) to protect the relay contacts from arcing.
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Current Limits: Ensure the total current per module does not exceed the backplane capacity or the specific terminal rating.
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Electrostatic Discharge (ESD): Handle the component by the edges or wear an ESD wrist strap to prevent damage to the internal circuitry.
5. Typical Applications
The 1746-RL51 is used wherever robust, isolated switching is required in a legacy or existing SLC 500 system:
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Motor Control: Activating starters and contactors.
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Solenoid Valves: Controlling pneumatic or hydraulic actuators in assembly lines.
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Lighting Systems: Switching high-voltage plant lighting or signaling towers.
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Interfacing: Acting as a bridge between the PLC logic and non-compatible voltage devices (e.g., a 24V PLC controlling a 120V siren).
Advantages: Foxboro, OVATION, TRICONEX, Allen-Bradley, ABB, Motorola, Siemens Moore, Ge Fanuc, Woodward, Bently Nevada and other major import brands!
We have the same series of models in stock. If you don’t find the model you need, please contact us and we will provide you with an official quotation！
Colour：new Warranty: 12 months
Lead Time：3-day working day Country of origin: Sweden
Price: Please contact us Product weight：0.515kg
Shipping Port: Xiamen, China
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