Description
Product Name:1771-ACN Allen Braley Central control module
Product details:
The 1771-A4BK is a 16-slot I/O chassis designed to house and power Allen-Bradley 1771 series I/O modules and PLC-5 processors. The “K” suffix indicates that this specific model features Conformal Coating, providing enhanced protection against harsh environmental conditions such as humidity, salt spray, and chemical contaminants.
Technical Specifications
| Feature | Specification |
| Number of Slots | 16 Slots |
| Backplane Current | 24A @ 5V DC (Maximum) |
| Mounting Type | Panel Mount (Horizontal) |
| Environmental Protection | Conformal Coated (K-version) |
| Module Compatibility | All 1771 I/O modules and PLC-5 processors |
| Power Supply | Requires external 1771 power supply (e.g., 1771-P7) |
| Operating Temperature | $0^circtext{C}$ to $60^circtext{C}$ ($32^circtext{F}$ to $140^circtext{F}$) |
| Dimensions | Approx. $12.4 times 19.0 times 7.6$ inches |
Key Advantages
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Environmental Resilience: The conformal coating makes it ideal for “dirty” industries (wastewater, oil & gas, or chemical processing) where airborne corrosives are present.
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High Density: With 16 slots, it allows for a high concentration of I/O points in a single rack, saving panel space.
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Reliability: Known for extreme durability; these units are designed to operate for decades in 24/7 industrial environments.
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Legacy Support: Essential for maintaining and repairing existing PLC-5 systems without the immediate need for a full, costly system migration.
Important Considerations & Precautions
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Power Loading: Ensure that the total current draw of all installed modules does not exceed the backplane’s 24A rating. Use a properly sized power supply.
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Module Placement: When using 2-slot addressing, modules must be placed in specific pairs to ensure the controller recognizes the I/O correctly.
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Electrostatic Discharge (ESD): Always use grounding straps when handling the chassis or inserting modules to avoid damaging the backplane circuitry.
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Lifecycle Status: The 1771 series is in the “End of Life” or “Discontinued” phase. Sourcing new units can be difficult, and most available stock is refurbished or surplus.
Industrial Applications
The 1771-A4BK is commonly found in large-scale industrial operations that have not yet fully transitioned to Ethernet-based platforms:
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Automotive Manufacturing: Managing assembly lines and heavy robotic integration.
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Water & Wastewater Treatment: Controlling pumps, valves, and chemical dosing in humid environments.
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Oil & Gas: Monitoring remote wellheads or refinery processes where atmospheric corrosion is a risk.
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Steel & Mining: Handling heavy-duty digital and analog signals in high-vibration and dusty areas.
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
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
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