PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1797-ACNR15 is a FLEX I/O ControlNet Ex Adapter for hazardous locations. It interfaces FLEX Ex I/O modules with a programmable controller processor scanner port. The unit provides two ControlNet BNC ports to support redundant network topologies. It accommodates up to eight FLEX Ex I/O modules with up to 128 total I/O points.
This adapter transmits data at 5 Mbps over ControlNet Protocol version 1.5. It provides galvanic isolation between the Flexbus backplane, power supply, and network nodes. The device mounts onto a standard steel DIN rail within an IP20 enclosure. Integrated status LEDs show communication activity, module operational status, and incoming power.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Weight | 1.50 lbs (0.68 kg) |
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| Product Description | 1797 Flex Ex Redundant ControlNet Adapter Module |
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| Communication Port | Two (2) ControlNet BNC |
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| IS Media type | Ex ib IIB/IIC T4; AEx ib IIC T4; Class I, Division 1 Groups A-G T4 |
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| IS Module Type | Ex ib IIB/IIC T4; AEx ib IIC T4; Class I Division 1 Groups A-D T4 |
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| Indicators | Comm A: red/grn; Comm B: red/grn; Module Status: red/grn; Power: grn |
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| Mounting | DIN Rail |
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| ControlNet Protocol | V 1.5 |
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| ControlNet cable | Allen Bradley RG-6/U Quad shield coax part number 1786-RG6 (standard-PVC CM-CL2) or 1786-RG6F/A (high-flex) |
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| Wire Size | 3.31 mm2 (12 AWG) stranded max 1.2 mm (3/64 in.), insulation, max |
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| Operating Temperature | -20…70 °C (-4…158 °F) |
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| Surrounding Temperature | -40…85 °C (-40…185 °F) |
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| Vibration | Tested 2 g @ 10…500 Hz per IEC 68-2-6 |
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| Operating Shock | Tested 15 g peak acceleration, 11 (±1) ms pulse width |
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| I/O Capacity | 8 |
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| Communication Rate | 5 Mbps |
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| Output Power | 5.4 Volts DC |
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| Power Supply | 9.5 Volts DC |
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| Power Consumption | 8.5 W |
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| Power Dissipation | 8.5 W |
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| Thermal Dissipation | 29 BTU/hour |
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TECHNICAL INFORMATION
Features
- Features two ControlNet BNC ports for redundant media network architectures.
- Accommodates up to 8 FLEX Ex I/O modules handling 128 I/O points.
- Operates at 5 Mbps communication speed using ControlNet Protocol V 1.5.
- Provides galvanic isolation between Flexbus backplane, power supplies, and network nodes.
- Delivers 5.4 V DC intrinsically safe output power to connected modules.
- Includes front-panel LED indicators for Comm A, Comm B, Module Status, and Power.
TECHNICAL INFORMATION
Applications
- Hazardous location process automation requiring intrinsic safety adherence.
- Redundant ControlNet field communication across industrial distributed I/O racks.
- FLEX Ex modular I/O interfacing with central controller scanner networks.
TECHNICAL INFORMATION
Connections / Interfaces
- Dual ControlNet coaxial BNC ports for redundant media trunk cables.
- Flexbus backplane interface supporting up to 8 distributed FLEX Ex I/O modules.
- Field power terminals accepting up to 3.31 mm2 (12 AWG) stranded copper conductors.
TECHNICAL INFORMATION
Installation Guidelines
- Mount on zinc-plated yellow-chromate steel DIN rail for proper intrinsic safety grounding.
- Avoid plastic DIN rails or materials susceptible to oxidation and surface corrosion.
- Corrosion on improper rails causes intermittent disconnection of intrinsic safety ground paths.
- Connect incoming power using 3.31 mm2 (12 AWG) stranded copper conductors.
- Maintain conductor insulation thickness at or below 1.2 mm (3/64 in.).
TECHNICAL INFORMATION
Configuration Guidelines
- Configure node network addresses according to ControlNet network architecture requirements.
- Verify redundant trunk connections across Comm A and Comm B BNC connectors.
- Monitor front-panel LED indicators to verify operational status and active communication links.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley FLEX Ex I/O modules.
- Operates with ControlNet Protocol version 1.5 networks.
- Uses standard RG-6/U quad shield coaxial media cables including 1786-RG6 and 1786-RG6F/A.
TECHNICAL INFORMATION
Compliance and Certifications
- Ex ib IIB/IIC T4
- AEx ib IIC T4
- Class I, Division 1 Groups A-D T4
- Class I, Division 1 Groups A-G T4
- CE
- UL
- c-UL
- IECEx
- FM
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley FLEX Ex I/O modules. Operates with ControlNet Protocol version 1.5 networks. Uses standard RG-6/U quad shield coaxial media cables including 1786-RG6 and 1786-RG6F/A.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
What is the function of the Allen-Bradley 1797-ACNR15 adapter?
The 1797-ACNR15 provides a redundant ControlNet Ex communication link for FLEX Ex I/O modules in hazardous areas.
How many I/O modules does the 1797-ACNR15 support?
The adapter accommodates a maximum of 8 FLEX Ex I/O modules with up to 128 total points.
Which DIN rail material is required to mount the 1797-ACNR15?
Mount the unit exclusively on zinc-plated yellow-chromate steel DIN rail to maintain intrinsic safety ground integrity.
What communication speed and protocol does the 1797-ACNR15 use?
It operates at a fixed communication rate of 5 Mbps using ControlNet Protocol Version 1.5.
