Allen-Bradley 1797-ACNR15 ControlNet Communication Interface Module

The Allen-Bradley 1797-ACNR15 is a ControlNet communication interface module designed for high-speed deterministic networking in distributed control and automation systems. This module provides reliable, real-time data exchange between CompactLogix or ControlLogix controllers and remote I/O racks, supporting complex industrial applications where timing precision and system reliability are critical.

Engineered for industrial environments, the 1797-ACNR15 delivers robust network connectivity with built-in diagnostics, ensuring continuous operation and minimizing system downtime.

Technical Specifications

Applications

The 1797-ACNR15 is commonly used in distributed control systems, including:

• Connecting remote FLEX I/O racks to a central ControlLogix controller.

• High-speed factory automation lines requiring deterministic control.

• Process automation in industries such as food and beverage, chemicals, and material handling.

• Integrating remote discrete or analog I/O devices while maintaining precise timing.

Its deterministic nature ensures consistent scan times and predictable network performance, which is crucial for real-time control applications.

Advantages

• High-speed Deterministic Communication: Supports precise timing across distributed control networks.

• Scalable: Allows multiple nodes on a single ControlNet segment.

• Robust Diagnostics: LEDs provide immediate feedback on network health and fault conditions.

• Seamless Integration: Works with 1797 FLEX I/O and ControlLogix/CompactLogix systems.

• Industrial Durability: Engineered to withstand vibration, temperature fluctuations, and electrical noise.

FAQs

1. Can multiple 1797-ACNR15 modules exist on the same ControlNet segment?

   Yes, the module supports up to 99 nodes per segment with proper addressing.

2. What is the typical scan time for a full I/O rack through this module?

   Dependent on network traffic, typically under 5 ms for 16–32 I/O points.

3. Does it provide built-in network fault diagnostics?

   Yes, LEDs indicate power, link, network activity, and fault states.

4. Is it compatible with both ControlLogix and CompactLogix controllers?

   Yes, fully compatible with 1756 and 1769 series controllers via ControlNet.

5. What is the maximum cable length for a ControlNet segment?

   Up to 100 meters per coaxial segment; fiber-optic extensions allow longer distances.

6. Can the module be hot-swapped?

   No, power must be removed before module installation or replacement.

7. Which network media types are supported?

   Coaxial cable (RG-6), fiber-optic, or via ControlNet repeaters.

8. Does it require external power?

   Yes, 24 VDC supply or power from the I/O chassis is required.

9. Is it suitable for high-humidity or high-temperature environments?

   Yes, rated for 0–60°C operation and 5–95% non-condensing humidity.

10. How is the module configured?

    Addressing and network configuration are done via RSNetWorx for ControlNet software.