PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1797-IE8NF is an intrinsically safe analog input module for the FLEX I/O platform. This module provides eight non-isolated input channels equipped with an integrated noise filter. Each channel accepts 0 to 20 mA or 4 to 20 mA current signals with 16-bit conversion resolution. The hardware supports field instruments operating in hazardous industrial environments without interposing barriers.
Engineered for demanding field installations, the unit mounts directly onto compatible terminal base units. It dissipates 5.2 W of power with a thermal dissipation rating of 17.75 BTU per hour. Field-side power consumption is rated at 7.5 W. Status indicators include one green power LED and eight individual red fault indicators for continuous channel diagnostic monitoring.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Weight | 0.63 lbs (0.28 kg) |
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| Functional Data Range | >15V @ 22 mA >21.5V @ 0 mA |
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| Data Format | Configurable |
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| Resolution | 16 bits |
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| Product Description | Flex Ex analog input Module |
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| No. of inputs | Eight (8) non-isolated inputs with integrated noise filter |
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| IS input type | Class I, II, III Division 1 & 2 Groups A-G T4 |
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| IS module type | Ex ib IIB/IIC T4, AEx ib IIC T4, Class I, Division 1 Group A-D T4 |
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| Indicators | 8 red fault indicators 1 green power indicator |
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| Terminal Base | 1797-TB3 or 1797-TB3S |
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| Conductor wire size | 4 mm2 (12 gauge) stranded; max 1.2 mm (3/64 in.) insulation max |
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| Keyswitch Position | 3 |
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| Inputs | 8 |
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| Input Type | Single-ended Non-isolated |
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| Module Field-side Power Consumption | 7.5 W |
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| Power Dissipation | 5.2 W |
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| Thermal Dissipation | 17.75 BTU/hour |
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| Step Response | 4 ms |
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TECHNICAL INFORMATION
Features
- Eight non-isolated analog input channels with integrated noise filtering.
- Individually configurable input ranges for 0 to 20 mA and 4 to 20 mA current loops.
- High-accuracy 16-bit analog-to-digital conversion resolution.
- Step response time of 4 ms for responsive loop monitoring.
- Eight dedicated red fault indicators and one green power status LED.
- Support for hazardous location intrinsically safe input circuits.
TECHNICAL INFORMATION
Applications
- Intrinsically safe analog current signal acquisition in hazardous process areas.
- Field transmitter monitoring in chemical, refining, and industrial manufacturing plants.
- Distributed I/O current loop measurement using the FLEX I/O architecture.
TECHNICAL INFORMATION
Connections / Interfaces
- Mounts on 1797-TB3 or 1797-TB3S terminal base assemblies.
- Supports conductor wire size up to 4 mm2 stranded wire with maximum 1.2 mm insulation.
- Requires keyswitch position 3 on the terminal base unit.
TECHNICAL INFORMATION
Installation Guidelines
- Verify that the terminal base keyswitch is set to position 3 prior to module insertion.
- Seat the module firmly onto the 1797-TB3 or 1797-TB3S terminal base.
- Use specified 4 mm2 stranded conductor wiring to maintain compliance and connection integrity.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure individual channel ranges for either 0 to 20 mA or 4 to 20 mA operation.
- Select appropriate data format settings to match controller program requirements.
- Perform calibration using a precision current source and meter if periodic routine service mandates adjustment.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley FLEX Ex 1797-TB3 and 1797-TB3S terminal base units.
- Interfaces with standard 0-20 mA and 4-20 mA industrial field transmitters.
TECHNICAL INFORMATION
Compliance and Certifications
- IS input type: Class I, II, III Division 1 & 2 Groups A-G T4.
- IS module type: Ex ib IIB/IIC T4, AEx ib IIC T4, Class I Division 1 Groups A-D T4.
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley FLEX Ex 1797-TB3 and 1797-TB3S terminal base units. Interfaces with standard 0-20 mA and 4-20 mA industrial field transmitters.
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 terminal bases support the 1797-IE8NF module?
The module mounts on Allen-Bradley 1797-TB3 and 1797-TB3S terminal bases using keyswitch position 3.
What is the resolution and response time of the 1797-IE8NF?
The module provides 16-bit analog-to-digital resolution and has a step response time of 4 ms.
What diagnostic indicators are present on the module?
The front faceplate includes one green power indicator and eight red fault indicators for individual channel diagnostics.
Does the 1797-IE8NF require field calibration upon arrival?
The module is factory-calibrated prior to shipment, though periodic calibration can be conducted using precision test instruments.
