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- Allen Bradley
- 1797-ACNR15
- Flex Ex ControlNet I/O Adapter Module
- USA
- 94 x 92 x 87 mm
- 0.2 kg
- Xiamen, China
- New & In Stock
- T/T, PayPal, Western Union
- 1 Year
- 1-3 Working Days
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We have a 10-year logistics and express cooperation agreement, so our products can be shipped to any place in the world.
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Our products are imported in bulk from the place of origin. Because of the cooperative relationship, our products are all original and 100% new.
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We provide 7*24 hours service to our customers. We will be there whenever you need us.
Price advantage
All our products are priced very favorably because we have our own warehouse and supply.
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Product Overview
The Allen-Bradley 1797-ACNR15 is a Flex Ex ControlNet I/O Adapter Module designed to connect FLEX Ex I/O systems to a ControlNet industrial network. It is specifically engineered for hazardous (Ex) environments, where intrinsic safety and redundant communication are required.
This module acts as the communication gateway between distributed Flex Ex I/O modules and a ControlNet PLC system, enabling reliable, high-speed, deterministic process control.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Model | 1797-ACNR15 |
| Product Line | FLEX Ex I/O |
| Product Type | ControlNet Ex I/O Adapter Module |
| Network Protocol | ControlNet (5 Mbps) |
| I/O Capacity | Up to 8 FLEX Ex I/O modules |
| Communication Ports | 2 × ControlNet coax BNC (redundant media support) |
| Power Supply | 24 VDC |
| Backplane Power | Integrated (5 VDC for I/O modules) |
| Dimensions | 94 × 92 × 87 mm |
| Weight | 0.2 kg |
| Mounting | DIN rail |
| Operating Temperature | -20°C to +70°C |
| Hazardous Area Rating | Ex ib IIB/IIC T4 (intrinsic safety certified) |
Function and Working Principle
The 1797-ACNR15 serves as a network adapter and I/O backplane controller:
- Connects FLEX Ex I/O modules to a ControlNet network.
- Acts as a communication bridge between PLC scanner and field I/O system.
- Provides built-in power conversion (24 VDC → backplane power).
- Supports redundant ControlNet media (dual coax ports) for high reliability.
- Enables deterministic communication for real-time process control.
In short, it allows a PLC to read and write field signals from hazardous-area I/O racks over ControlNet.
Key Features
- Supports up to 8 FLEX Ex I/O modules
- Dual redundant ControlNet BNC ports
- Designed for intrinsically safe (Ex) environments
- Built-in backplane power supply
- Deterministic 5 Mbps ControlNet communication
- Compact DIN rail-mounted design
- High diagnostic visibility via LED indicators
- Supports hot insertion/removal of I/O modules
Industrial Applications
- Oil & gas offshore platforms
- Chemical and petrochemical plants
- Refinery process control systems
- Hazardous-area instrumentation systems
- Power generation auxiliary systems
- Large-scale distributed process automation
Installation Overview
- Mounted on DIN rail inside FLEX Ex I/O chassis
- Connects to PLC via ControlNet coax network (BNC connectors)
- Powered by 24 VDC supply
- Supports redundant network wiring for high availability
- Configured through PLC engineering software (ControlLogix environment)
Compatible Systems
- Allen-Bradley ControlLogix PLC systems
- FLEX Ex I/O modules (1797 series)
- ControlNet network infrastructure
- Redundant process control architectures
- Hazardous area instrumentation systems
Alternative Modules
| Model | Description |
|---|---|
| 1797-ACNR15 | FLEX Ex ControlNet redundant I/O adapter (this model) |
| 1794-ACNR15 | Standard FLEX I/O ControlNet adapter (non-Ex version) |
| 1786-RPA / 1786-RPFRXL | ControlNet repeaters for network extension |
| 1756-CN2R | ControlLogix ControlNet communication module (modern PLC interface) |
| 1734-AENTR | Ethernet/IP FLEX I/O adapter (modern replacement path) |
Key Advantages
- High reliability in hazardous industrial environments
- Redundant ControlNet media support for uptime assurance
- Compact, modular FLEX Ex architecture
- Deterministic high-speed communication (5 Mbps)
- Integrated power distribution for I/O modules
- Strong integration with Rockwell ControlLogix systems
Technical FAQs
What is the main purpose of the 1797-ACNR15?
It connects FLEX Ex I/O modules to a ControlNet PLC network.
How many I/O modules can it support?
Up to 8 FLEX Ex I/O modules.
Is it suitable for hazardous environments?
Yes, it is certified for intrinsic safety (Ex-rated applications).
Does it support Ethernet?
No, it uses ControlNet coaxial communication.
Is it still widely used today?
Mostly in legacy or long-life process industries, though newer systems migrate to Ethernet/IP FLEX I/O.
Conclusion
The Allen-Bradley 1797-ACNR15 is a specialized hazardous-area ControlNet I/O adapter designed for reliable, redundant communication between PLC systems and FLEX Ex I/O modules. While it belongs to an older ControlNet architecture, it remains critical in high-integrity process industries where safety, stability, and deterministic control are essential.