Allen‑Bradley 1794‑ACNR15 Redundant ControlNet Adapter & 24VDC Power Module
1. Product Overview
The 1794‑ACNR15 is a Flex I/O series redundant ControlNet communication adapter integrated with an internal 24VDC power conversion unit, developed by Allen‑Bradley.
It acts as a core gateway to connect up to 8 pieces of Flex I/O terminal modules to the ControlNet industrial fieldbus network. Equipped with dual independent BNC ControlNet ports to build fully redundant network topology, it automatically switches data transmission channel once one trunk line fails, eliminating single‑point communication breakdown.
This module takes nominal 24VDC external input power, converts it into stable 5V Flexbus bus power to drive cascaded I/O modules, realizing signal acquisition, logic output and real‑time data interaction between upper PLC controllers and on‑site field sensors & actuators, widely deployed in distributed automation control systems with high continuity requirements.
2. Core Product Advantages
Dual‑Port Redundant ControlNet Design
Two separate ControlNet BNC interfaces for primary & backup network links. Seamless automatic failover without manual intervention when one cable or network path malfunctions, drastically boosting system operation stability and avoiding unexpected downtime.
Built‑in Isolated Power Supply Conversion
Accepts wide‑range 24VDC input and outputs regulated 5V Flexbus power for downstream I/O modules; reinforced isolation circuit between power loop and communication bus to resist industrial electromagnetic interference.
High Compatibility & Flexible Expansion
Supports arbitrary combination of maximum 8 Flex I/O digital/analog modules, freely expand input/output points according to on‑site construction demands, compatible with the entire 1794 Flex I/O product ecosystem.
5 Mbps Deterministic High‑Speed Transmission
Adopts standard ControlNet V1.5 protocol with fixed 5Mbps baud rate, ensuring deterministic, repeatable real‑time data delivery, perfectly matching the low‑latency control demands of process and discrete manufacturing.
Multi‑LED Visual Diagnostic Indicators
Independent status LEDs for I/O bus, Channel A & Channel B communication ports; clearly display power status, network connection, wiring fault and module error codes, greatly simplifying on‑site debugging and routine maintenance.
Standard DIN Rail Quick Installation
Complies with EN 60715 35mm DIN rail mounting standard, supports both rail installation and direct panel mounting, compact structure saves cabinet internal layout space.
3. Detailed Technical Specifications
| Item |
Official Parameter |
| Model |
1794‑ACNR15 (Allen‑Bradley Flex I/O Redundant ControlNet Adapter) |
| Nominal Input Power |
24VDC |
| Input Voltage Range |
19.2V ~ 31.2V DC (covers 5% AC ripple tolerance) |
| Rated Input Current |
330mA typical / Max 450mA |
| Inrush Current |
23A within 2ms at power‑on |
| Flexbus Output |
5V DC, Max 640mA |
| Communication Protocol |
ControlNet V1.25 / V1.5 |
| Transmission Speed |
5 Mbps |
| Network Interface |
2 × BNC ControlNet redundant ports + 1 × RJ45 NAP programming access port |
| Maximum Expandable I/O |
8 Flex I/O modules in any mix |
| Isolation Withstand Voltage |
850V DC for 1 second (between power side & Flexbus) |
| Max Power Dissipation |
4.6W @ 19.2V DC |
| Terminal Screw Torque |
0.8 N·m (7 pound‑inches) |
| Overall Dimension |
87mm (H) × 94mm (W) × 69mm (D) |
| Net Weight |
Approx 450g |
| Operating Ambient Temp |
0℃ ~ +55℃ (standard version); ‑25℃ ~ +70℃ for XT extended temp variant |
| Storage Temperature |
‑25℃ ~ +85℃ |
| Humidity Condition |
5% ~ 95% RH, non‑condensing |
| Anti‑Vibration & Shock |
Conforms to IEC 60068‑2‑6, IEC 60068‑2‑27 industrial environmental standards |
| Wire Gauge Range |
Solid wire: 0.33~2.5mm²; Stranded wire: 0.33~1.3mm² |
4. Application Industries & Typical Scenarios
Main Applicable Industries
Oil & Gas Exploitation, Water Treatment & Sewage Control, Pharmaceutical Production Line, Automobile Assembly Workshop, Mining Automation, Power Plant Auxiliary Control, Port Logistics Conveying System, Food & Beverage Process Control, Hazardous Zone Explosion‑Proof Automation
Typical Application Scenarios
- Process Industry Distributed Control
Build redundant ControlNet ring network for chemical and petrochemical plants to guarantee uninterrupted monitoring of pipeline pressure, valve switch and tank level signals.
- Automotive Manufacturing Workshop
Connect assembly line fixture sensors, clamping cylinders and safety interlock switches via Flex I/O groups, realizing stable distributed signal collection with anti‑breakdown network backup.
- Water & Wastewater Engineering
Deploy on pump stations and sedimentation tanks for remote start‑stop control of water pumps and real‑time feedback of liquid level analog data.
- Hazardous Area Site Control
Can be installed in IP54 certified explosion‑proof enclosures to meet ATEX / IECEx Zone 2 hazardous location application requirements.
Warehouse Stock Reference
All modules are packed with original anti‑static electrostatic packaging, stored in classified industrial component storage racks with complete batch traceability and incoming quality inspection, supporting bulk order and formal export customs declaration.
5. Compliance Export Qualification Statement
This product fully complies with international cross‑border export specifications and
- Possesses CE, UKCA, UL Listed, ATEX, IECEx, KC, RCM multi‑national compulsory certifications.
- Meets EU EMC Directive EN 61000‑6‑2 / EN 61000‑6‑4, Low Voltage Directive 2014/35/EU, RoHS 2.0 environmental restriction standard.
- Supports complete official declaration of conformity, product origin certification and customs clearance documents for global sea freight, air freight and express export procedures.
- Original factory 12‑month warranty is provided for brand new authentic products.
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