PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1794-IM8 is an eight-channel digital input module for the FLEX I/O distributed system. This unit detects 240V AC input signals across modular industrial field circuits. It operates in an open-style enclosure alongside an adapter and terminal unit. The module provides non-isolated channel connections with individual channel insulation.
This input module mounts to a terminal base such as model 1794-TBN. Installation supports panel screw mounting or standard DIN rail mounting options. It draws 30 mA of flexbus current from the system backplane at 5V DC. The physical assembly measures 94 by 94 by 91 millimeters. Operating temperature ratings span from 0 to 55 degrees Celsius.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Product Line | Flex I/O 1794 |
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| UPC | 612598179930 |
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| Weight | 0.13 lbs (0.06 kg) |
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| Inputs | 8 Nonisolated |
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| On-state Voltage nom. | 240V AC |
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| On-state Current max. | 13.21 mA |
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| Off-state Voltage max. | 40V AC |
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| Off-state Current max. | 2.6mA |
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| Nominal Input Impedance | 22.3 k? |
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| Nominal Input Current | 12mA @ 240V AC |
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| Isolation Voltage | 250V Continuous |
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| Flexbus Current | 30mA @ 5V DC |
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| Thermal Dissipation | 16.2 BTU/hr. @ 264V AC max. |
|---|
TECHNICAL INFORMATION
Features
- Provides eight non-isolated digital input channels operating at 240V AC nominal.
- Draws 30 mA flexbus current at 5V DC from the communication backplane.
- Limits thermal dissipation to 16.2 BTU per hour maximum at 264V AC.
- Maintains continuous electrical isolation rated at 250V continuous.
- Mounts using direct panel screws or standard industrial DIN rail.
TECHNICAL INFORMATION
Applications
- Alternating current signal sensing in 240V AC industrial control circuits.
- Digital signal monitoring in hazardous location installations between 0 and 55 degrees Celsius.
- Modular input expansion using distributed FLEX I/O system architectures.
TECHNICAL INFORMATION
Connections / Interfaces
- Connects to a terminal base unit such as the 1794-TBN part.
- Communicates across the internal 5V DC flexbus interface.
- Provides dedicated wiring labels for field wiring connections.
TECHNICAL INFORMATION
Installation Guidelines
- Mount the unit to a DIN rail or attach via screw mounting.
- Ensure the flexbus is fully inserted before operating the module.
- Install appropriate fuses to prevent electrical damage to the device.
TECHNICAL INFORMATION
Configuration Guidelines
- Align the terminal base key switch with the eight designated switch positions.
- Confirm module seating to establish proper communication over the local flexbus.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley FLEX I/O terminal bases including the 1794-TBN.
- Integrates with FLEX I/O network adapters and modular backplane assemblies.
TECHNICAL INFORMATION
Compliance and Certifications
- Approved for operation in classified hazardous locations.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley FLEX I/O terminal bases including the 1794-TBN. Integrates with FLEX I/O network adapters and modular backplane assemblies.
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 nominal operating voltage of the 1794-IM8?
The module operates at a nominal input voltage of 240V AC across eight non-isolated channels.
How much backplane current does the 1794-IM8 consume?
The module consumes 30 mA of flexbus current at 5V DC from the system backplane.
Which terminal base unit can be used with the 1794-IM8?
The module mounts onto compatible FLEX I/O terminal bases including model 1794-TBN.
