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1771-ACNR15

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The Allen Bradley 1771-ACNR15 is a ControlNet adapter module designed for the PLC-5 platform, featuring built-in redundant coaxial media support to eliminate single points of failure in critical remote I/O networks.
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Technical specifications for 1771-ACNR15

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1771-ACNR15
  • Product Family:
    PLC-5
  • Product Type:
    ControlNet Redundant Media Adapter Module
  • Stock:
    1
  • Communication Rate:
    5 Mbps
  • Media Redundancy:
    Yes
  • Network Access Port (NAP):
    1 x RJ-45
  • Backplane Current:
    1.0 A at 5V DC
  • Power Dissipation:
    5.0 W (Max)
  • Operating Temperature:
    0 °C to 60 °C (32 °F to 140 °F)
  • Storage Temperature:
    -40 °C to 85 °C (-40 °F to 185 °F)
  • Relative Humidity:
    5% to 95% (non-condensing)
  • Keying Position (Upper/Lower):
    54-56 / 16-18
  • Weight:
    0.96 kg
  • Estimated shipping dimensions:
    5x16.5x27.4cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Applications Operating Environment Safety & Compliance

Features:

  • True Redundant Media for Zero-Downtime Operations
  • Non-Disruptive Diagnostics with NAP & Status Display
  • Legacy I/O Optimization with Flexible Addressing
The Allen Bradley 1771-ACNR15 is equipped with dual BNC connectors that support fully redundant ControlNet trunk lines. In critical processes such as refinery shutdown systems or mining conveyors, a single cable break will not stop your production. The adapter automatically fails over from Channel A to Channel B with no logic program interruption, ensuring continuous I/O refresh.

Unlike passive adapters, the Allen Bradley 1771-ACNR15 features a built-in Network Access Port (NAP) and an alphanumeric status display. Engineers can plug a programming terminal into the NAP to monitor traffic or change parameters without disconnecting the main trunk cable. The front-panel display provides real-time mnemonics (e.g., DUPL NODE, SHRT BP, IDLE), allowing field technicians to diagnose duplicate addresses or backplane shorts in under 30 seconds.

The Allen Bradley 1771-ACNR15 supports 2-slot, 1-slot, and 1/2-slot addressing modes. This flexibility allows you to mix standard 8-point modules, high-density 16-point modules, and quad-density 32-point modules in the same chassis. For system upgrades, you can maximize I/O density by using 1/2-slot addressing, effectively doubling the I/O count per physical chassis without adding hardware.

The 1771-ACNR15 Allen Bradley ControlNet Redundant Media Adapter Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen Bradley 1771-ACNR15 ControlNet Redundant Media Adapter Module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Allen Bradley 1771-ACNR15 ControlNet Redundant Media Adapter Module

General

  • Manufacturer Allen Bradley
  • Model 1771-ACNR15
  • Condition New Original ready stock
  • Product Family 1771-P4S1,1771-ACN15,1771-ACN
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Oil & Gas Pipeline SCADA: The Allen Bradley 1771-ACNR15 ensures reliable remote I/O data acquisition over long distances (up to 1,000m per segment) where redundant coax prevents communication loss due to rodent damage or corrosion.
  • Mining & Metals (Conveyor Systems): Used to control 1771 DC drive interfaces and motor control centers (MCCs) in high-vibration environments, leveraging the 5 Mbps deterministic speed for emergency stops.
  • Water/Wastewater Treatment Plants: Ideal for retrofitting legacy PLC-5 systems that control pump stations and chemical dosing, allowing operators to add redundant media without rewriting ladder logic.
  • Automotive Assembly Lines: Deployed in body shops and paint shops to connect I/O racks for robotic welding controls, where the NAP port allows line-side troubleshooting without halting production.
  • Indoor Industrial Use Only: The Allen Bradley 1771-ACNR15 is rated for pollution degree 2 (non-conductive pollution) and must be installed in a NEMA-rated enclosure if exposed to airborne dust or oil mist.
  • Temperature Management: Relies on convection cooling; requires 2 inches (50mm) of free space above and below the module for passive airflow. Sustained operation at 60°C requires a verified chassis backplane current below 4A total.
  • Shock & Vibration: Designed for 2.5G peak acceleration (operating) and 5G (non-operating) per IEC 68-2-6, making it suitable for compressor skids or vibrating screens but not direct engine mounting.
  • Altitude Derating: Maximum operating altitude is 2,000 meters (6,560 feet) without derating; above this, the 60°C maximum temperature must be reduced by 5°C per 1,000 meters.
  • CE Marking (EMC Directive 89/336/EEC): The Allen Bradley 1771-ACNR15 complies with EN 50081-2 (industrial emission) and EN 50082-2 (industrial immunity), ensuring it does not interfere with nearby sensitive instrumentation.
  • Low Voltage Directive (73/23/EEC): Tested to EN 61131-2 (Programmable Controller safety requirements), confirming safe isolation between the ControlNet ports and the chassis backplane.
  • Hazardous Location (Restricted): Not ATEX or IECEx certified. For Class I, Division 2 (gas) environments, the module must be installed in a purged or explosion-proof enclosure as per API 14F.
  • Obsolete Status Management: While no longer in active production by Rockwell Automation, the Allen Bradley 1771-ACNR15 remains supported via third-party lifecycle management services (repair/exchange) until 2030+ for legacy asset protection.
Description
The Allen Bradley 1771-ACNR15 serves as the backbone for reliable remote I/O communication in legacy PLC-5 control systems. Unlike standard adapters, this module is engineered with dual BNC ports (Channel A & Channel B), enabling a redundant coaxial cable topology. This design ensures that if the primary communication path fails due to cable damage or signal degradation, the adapter automatically switches to the secondary path without interrupting process control.

As a drop-in solution for 1771 I/O chassis, the Allen Bradley 1771-ACNR15 occupies the mandatory leftmost slot and converts standard 1771 discrete and analog I/O into deterministic, high-speed ControlNet traffic (5 Mbps). It supports all three classic addressing modes (2-slot, 1-slot, 1/2-slot), providing backward compatibility with legacy installations while allowing for optimized I/O density.

For system integrators facing aging Remote I/O (RIO) networks, the Allen Bradley 1771-ACNR15 offers a migration path to ControlNet without replacing existing 1771 I/O modules. Its built-in Network Access Port (NAP) also allows temporary connection of a programming terminal directly to the network, simplifying diagnostics and configuration in live plants.
Revisions

Revision Part #

Also known as

1771-ACNR15 Ser A
1771-ACNR15/A, Series A, Rev A
1771-ACNR15 Ser B
1771-ACNR15/B, Series B, Rev B
Alternative Names
1771ACNR15 I77I-ACNRI5 1771-ACNRI5 1771ACNRI5 1771-P4S1 1771-IA 1771-IM 1771-OM
Technical notes
The Allen Bradley 1771-ACNR15 strictly requires a backplane current of 1.0A at 5V DC and must be physically keyed between pins 54-56 (upper) and 16-18 (lower) in the chassis. Users must note that while the module supports redundant media, the controlling processor on the ControlNet network must have a unique address from 01 to 99, with address 01 reserved for the master controller.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What is the exact software and firmware compatibility requirement for the Allen Bradley 1771-ACNR15?
The Allen Bradley 1771-ACNR15 requires RSLogix 5 (version 4.5 or later) for processor configuration and RSNetWorx for ControlNet (version 4.0 or later) to schedule the network update time (NUT). The module firmware (series A/B) must match the map table entry; switching from a non-redundant 1771-ACN15 to the 1771-ACNR15 requires re-mapping the module type in the I/O configuration.
How do I wire a third-party device to the Allen Bradley 1771-ACNR15 if it doesn't have BNC ports?
The Allen Bradley 1771-ACNR15 communicates exclusively via ControlNet (5 Mbps) using 75-ohm RG-6 coaxial cable. Third-party devices must be connected via a ControlNet tap (catalog 1786-TPS or 1786-TPR) to the trunk line. The adapter does not support direct serial (RS-232) or Ethernet conversion; for non-ControlNet devices, you must use a gateway like the 1784-PCICS or a ProSoft ControlNet-to-DF1 bridge.
The status display on my Allen Bradley 1771-ACNR15 shows "SHRT BP". What is the diagnostic depth here?
The "SHRT BP" mnemonic on the Allen Bradley 1771-ACNR15 indicates a shorted backplane or excessive noise on the 5V DC rail. To diagnose, remove all I/O modules except the adapter; if the error clears, reinsert modules one by one to find the faulty unit. If the error persists, use a multimeter to check for continuity between the backplane pins on the chassis itself—this often reveals a damaged 1771-A series chassis.
Can the Allen Bradley 1771-ACNR15 operate in extreme ambient temperatures inside a steel mill?
The Allen Bradley 1771-ACNR15 has an operating range of 0°C to 60°C (32°F to 140°F) and a storage range of -40°C to 85°C. For steel mill applications near furnaces (exceeding 60°C), the module must be installed in a climate-controlled NEMA 12/4 enclosure. The module is not rated for condensing humidity (95% non-condensing max) nor explosive gas atmospheres without additional purging.
Is the Allen Bradley 1771-ACNR15 compliant with SIL 2 or SIL 3 safety standards?
No. The Allen Bradley 1771-ACNR15 is a standard communication module designed for general industrial control, certified under CE (EMC & Low Voltage Directives) but not IEC 61508 for functional safety. For safety-critical applications (ESD, F&G), you must use a redundant pair of these modules in a voting architecture (1oo2) or migrate to a GuardLogix/Trusted system.

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