1794-ACNR15 | Allen-Bradley Redundant ControlNet Adapter Supplier

1794-ACNR15 Product Overview

When a ControlNet trunk fails, the 1794-ACNR15 automatically reroutes data to the second trunk. This redundant media adapter from Allen-Bradley is part of the Flex I/O family. It mounts on a DIN rail and features two ControlNet BNC ports. Engineers use it to implement a redundant ControlNet data highway in various industrial applications.

Key Features & Technical Specs

• Manufacturer: Rockwell Automation.
• Brand: Allen-Bradley.
• Product type: Redundant Media ControlNet Adapter.
• Communication ports: Two (2) ControlNet BNC.
• Data transfer speed: 5 Mbps.
• ControlNet protocol version: V 1.25.
• Power dissipation: 3.4 W maximum at 19.2 V DC.
• Input voltage range: 19.2–31.2 V DC.
• Power consumption: 400 mA maximum from external 24 V supply.
• Thermal dissipation: 15.7 BTU/hr at 19.2 V DC.
• Flexbus output current: 640 mA maximum.
• Isolation voltage: 850 V DC.
• Inrush current: 23 A for 2 ms.
• Current draw: 450 mA maximum.
• Operating temperature: –20 to 55 °C (–4 to 131 °F).
• Surrounding temperature: 55 °C (131 °F).
• Vibration: IEC 60068-2-6 (Test Fc, Operating): 5 g at 10–500 Hz.
• Operating shock: IEC 60068-2-27 (Test Ea, Unpackaged Shock): 30 g.
• Indicators: Comm A (red/green), Comm B (red/green), I/O status (red/green).
• Mounting: DIN rail.
• ControlNet cable: 3.31 mm² (12 AWG) stranded, max 1.2 mm (3/64 in.) insulation.
• Supports up to eight (8) Flex I/O modules.

Unique insight: The dual ControlNet ports enable true redundancy. If one trunk fails, the second trunk keeps communication alive. This feature minimizes downtime in critical processes.

Applications & Use Cases

The 1794-ACNR15 suits applications that demand high reliability. For example, in oil and gas refineries, a single network failure can halt production. This adapter’s redundant design ensures continuous data flow. Similarly, water treatment plants use it to maintain control over distributed I/O. The module works with any combination of eight Flex I/O modules, offering flexibility for various automation tasks.

Installation & Setup

Mount the 1794-ACNR15 on a DIN rail. Use 0.33–2.5 mm² (22–12 AWG) solid or stranded copper wire for power connections. The insulation rating must be 75 °C (167 °F) or greater, with a maximum thickness of 1.2 mm (3/64 in.). For double wire connections, use 0.33–1.3 mm² (22–16 AWG) wire of the same type. Torque the mounting screws to 7 pound-inches. Connect each ControlNet BNC port to its respective trunk. Apply 19.2–31.2 V DC external power. The module draws up to 400 mA from the 24 V supply.

Maintenance & Reliability

Inspect the 1794-ACNR15 periodically for loose connections or damaged cables. The LED indicators (Comm A, Comm B, I/O status) provide quick status checks. Operating in the specified temperature range (–20 to 55 °C) and avoiding excessive shock (30 g operating) extend service life. The module dissipates only 3.4 W, reducing heat buildup in the enclosure. Regular inspection per the manufacturer’s manual helps maintain reliable operation.

Compatibility & Integration

The 1794-ACNR15 integrates with ControlNet networks using version 1.25 protocol. It connects to two ControlNet trunks via BNC ports. The adapter works with any combination of up to eight Flex I/O modules. This makes it compatible with a wide range of Allen-Bradley I/O modules. For specific module compatibility, refer to the official Flex I/O documentation.

Troubleshooting & Common Issues

If the I/O status LED is off, check the external power supply. Ensure the input voltage is within 19.2–31.2 V DC. If Comm A or Comm B LEDs show red, inspect the corresponding ControlNet cable. Use the specified cable: 3.31 mm² (12 AWG) stranded with max 1.2 mm insulation. Verify the data transfer speed is set to 5 Mbps. If problems persist, consult the Allen-Bradley manual or contact Petro Auto Tech.

FAQ about 1794-ACNR15

Q: What is the maximum power dissipation of the 1794-ACNR15?

A: The maximum power dissipation is 3.4 W at 19.2 V DC.

Q: How many Flex I/O modules can the 1794-ACNR15 support?

A: It supports up to eight (8) Flex I/O modules in any combination.

Q: What is the input voltage range for the 1794-ACNR15?

A: The input voltage range is 19.2–31.2 V DC.

Q: Does the 1794-ACNR15 support redundant ControlNet?

A: Yes, it has two ControlNet BNC ports for redundant trunk connections.

Q: What is the operating temperature range of the 1794-ACNR15?

A: The operating temperature range is –20 to 55 °C (–4 to 131 °F).

Q: What is the data transfer speed of the 1794-ACNR15?

A: The data transfer speed is 5 Mbps.

Product Support & Availability

The 1794-ACNR15 is in stock and ready to ship from Petro Auto Tech. As an industrial automation parts supplier, Petro Auto Tech offers fast delivery and dedicated support. Contact us to verify current lifecycle status and availability before ordering.