Description
Product Name: 1774-XE Allen Braley Programmable controller
Product details:
The Allen-Bradley 1774-XE is a specialized memory expansion or processor enhancement module belonging to the legacy PLC-1 family (specifically the 1774 series). While it is a “classic” or legacy component in the industrial automation world, it remains critical for maintaining older systems that rely on the PLC-1 architecture.
1. Detailed Product Description
The 1774-XE is designed as a Processor Expansion Module for the Allen-Bradley PLC-1 system. It was engineered to extend the processing capabilities and memory addressing of the original 1774-L processors. It allows the system to handle more complex logic and larger I/O configurations than the base unit could support independently.
2. Technical Specifications (Parameters)
Note: Due to its legacy status, exact specs can vary based on the hardware revision (Series A, B, etc.).
| Feature | Specification |
| Series | PLC-1 (1774) |
| Module Type | Processor Expansion / Memory Module |
| Power Consumption | Typically 5V DC (supplied via backplane) |
| Mounting | 1774 Chassis / Rack Mount |
| Operating Temp | 0 to 60°C (32 to 140°F) |
| Storage Temp | -40 to 85°C (-40 to 185°F) |
| Humidity | 5% to 95% (non-condensing) |
| Communication | Proprietary 1774 Backplane Interface |
3. Key Advantages
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System Longevity: Enables facilities to keep original PLC-1 systems running without a full, expensive “rip-and-replace” migration to modern PLCs.
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Expanded Logic Capacity: Provides the necessary resources to run more sophisticated rungs of ladder logic.
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Rugged Design: Built during an era of over-engineering, these modules are known for extreme durability in harsh industrial environments (dust, vibration, and heat).
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Plug-and-Play (Legacy): Designed to slide directly into the 1774 chassis, requiring minimal rewiring of the primary CPU.
4. Important Considerations & Precautions
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Obsolescence: The 1774-XE is a discontinued (silver series) product. New units are generally not available; most are “refurbished” or “used.”
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Electrostatic Discharge (ESD): Like all vintage electronics, these boards are sensitive to static. Always use a grounding strap when handling.
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Power Down: Never insert or remove the 1774-XE while the chassis is powered. This can result in permanent damage to the module or the backplane.
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Battery Maintenance: If the module utilizes CMOS memory, ensure that any associated system batteries are replaced regularly to prevent program loss.
5. Product Applications
The 1774-XE is primarily found in heavy industrial sectors that established their automation infrastructure in the late 1970s and 1980s:
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Steel Mills & Foundries: Managing complex furnace controls and conveyor systems.
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Automotive Assembly: Handling legacy line controls where high-speed logic was required.
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Power Plants: Controlling auxiliary systems that have not yet been migrated to DCS or modern ControlLogix systems.
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Food & Beverage: Early automated mixing and bottling lines.
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
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