Allen-Bradley 1771-ACN15 ControlNet I/O Adapter Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1771-ACN15 is a ControlNet I/O Adapter Module designed for use in the PLC-5 1771 I/O chassis. It enables high-speed, deterministic communication between the ControlNet network and 1771 I/O modules, making it a critical component in legacy Rockwell Automation control systems. This page provides full technical specifications, compatible replacement options, and a structured selection guide to help engineers and procurement teams make informed decisions.
Technical Specifications
- Part Number: 1771-ACN15
- Manufacturer: Allen-Bradley / Rockwell Automation
- Series: PLC-5 / 1771 I/O
- Function: ControlNet I/O Adapter Module
- Network Protocol: ControlNet (IEEE 802.3)
- ControlNet Data Rate: 5 Mbps
- I/O Chassis Compatibility: 1771 I/O Chassis
- Max I/O Modules per Chassis: Up to 16 modules
- Backplane Current Draw: 800 mA @ 5 VDC
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Storage Temperature: -40°C to 85°C
- Relative Humidity: 5% to 95% (non-condensing)
- Dimensions: Single-slot module
- Certifications: UL, CE, CSA
- Power Supply Voltage: 5 VDC (backplane powered)
Compatible Replacement & Equivalent Models
When the 1771-ACN15 is unavailable or end-of-life, the following models may serve as functional replacements depending on your system configuration. Always verify compatibility with your specific chassis revision and ControlNet network topology before substitution.
- 1771-ACN — Earlier ControlNet adapter for 1771 chassis; functionally similar but verify firmware revision compatibility
- 1771-ACNR15 — Redundant media version of the ACN15; drop-in replacement with added redundancy support
- 1771-ACNR — Redundant ControlNet adapter; suitable where dual-cable ControlNet is deployed
- 1756-CNB / 1756-CNBR — ControlLogix ControlNet Bridge; applicable in system migration from PLC-5 to ControlLogix platform
- 1771-SDN — DeviceNet Scanner; alternative only if migrating I/O network from ControlNet to DeviceNet
Note: Third-party compatible modules may be available. Contact support@konmask.com for verified cross-reference options.
Why Choose the Original 1771-ACN15
- Proven Reliability: Factory-tested and validated for deterministic ControlNet communication in demanding industrial environments
- Full Rockwell Compatibility: Guaranteed interoperability with RSLogix 5, RSNetWorx for ControlNet, and all 1771 I/O modules
- Stable Legacy Support: Ideal for facilities maintaining existing PLC-5 infrastructure without full migration
- Reduced Integration Risk: No firmware re-mapping or network re-configuration required versus third-party alternatives
- Traceable Sourcing: All units at Konmask.com are sourced from verified supply chains with full traceability documentation available on request
Typical Applications
- Automotive assembly line control systems using PLC-5 and ControlNet backbone
- Water and wastewater treatment plant SCADA integration
- Oil & gas upstream/downstream process control panels
- Food and beverage production lines with legacy 1771 I/O infrastructure
- Power generation and distribution control rooms
- Pharmaceutical batch processing systems requiring deterministic I/O scanning
System Compatibility
- PLC Platform: Allen-Bradley PLC-5 series (1785-Lxx)
- I/O Chassis: 1771-A1B, 1771-A2B, 1771-A3B, 1771-A4B series
- Programming Software: RSLogix 5 (v8.x and above)
- Network Configuration: RSNetWorx for ControlNet
- ControlNet Tap: 1786-TPS, 1786-TPYR (coax), 1786-TPR (fiber)
- Power Supply: 1771-P4S, 1771-P6S, 1771-P7 (chassis-dependent)
Selection Guide
Use the following criteria to determine whether the 1771-ACN15 is the correct module for your application:
- Step 1 — Confirm Network Protocol: Verify your plant network uses ControlNet (not DeviceNet or EtherNet/IP). The 1771-ACN15 is ControlNet-only.
- Step 2 — Check Chassis Slot: Confirm your 1771 chassis has an available single-width slot in the adapter position (leftmost slot).
- Step 3 — Redundancy Requirement: If dual-cable ControlNet redundancy is required, select the 1771-ACNR15 instead.
- Step 4 — Node Address: Plan your ControlNet node address (1–99 recommended range) before installation; set via rotary switches on the module face.
- Step 5 — Firmware Revision: Match firmware revision to your RSLogix 5 and RSNetWorx versions. Contact us if you need a specific revision.
- Step 6 — Migration Path: If planning a future migration to ControlLogix, consider the 1756-CNB as a long-term alternative to avoid repeat procurement.
Quality Assurance & Sourcing
- All 1771-ACN15 units are inspected upon receipt for physical integrity, label authenticity, and connector condition
- Functional testing available on request prior to shipment
- Units sourced from authorized distributors, OEM surplus, and verified industrial resellers
- Certificate of Conformance (CoC) and test reports available for qualified orders
- Packaging: anti-static bag, foam-lined box, with original documentation where available
How to Order
- Part Number: 1771-ACN15
- Manufacturer: Allen-Bradley / Rockwell Automation
- Add to cart directly on this page, or contact us for bulk pricing, lead time, and availability confirmation
- Email: support@konmask.com
- Phone/WhatsApp: +0086 19859288691
- Typical lead time: 3–7 business days for in-stock units; 2–4 weeks for sourced orders
- Export documentation (commercial invoice, packing list, CO) available for international orders
Replacement & Compatibility FAQ
Q: Can the 1771-ACN15 be used in a ControlLogix chassis?
A: No. The 1771-ACN15 is designed exclusively for the 1771 I/O chassis. For ControlLogix, use the 1756-CNB or 1756-CNBR.
Q: Is the 1771-ACNR15 a direct drop-in replacement?
A: Yes, the 1771-ACNR15 is pin-compatible and functionally equivalent, with the addition of redundant media support. It can replace the ACN15 without chassis modification.
Q: What is the difference between 1771-ACN and 1771-ACN15?
A: The “15” suffix denotes a later hardware revision with improved ControlNet performance and broader firmware compatibility. The ACN15 is the preferred variant for current installations.
Q: Can I use a third-party ControlNet adapter in place of the 1771-ACN15?
A: Third-party adapters may be available, but Rockwell Automation does not officially support them. Compatibility must be validated on a case-by-case basis. Contact us for guidance.
Q: Do you offer warranty on the 1771-ACN15?
A: Yes. Konmask.com provides a 90-day functional warranty on all modules. Extended warranty options are available — contact us for details.
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Contact: support@konmask.com | +0086 19859288691
