PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1794-IB8 is a FLEX I/O Digital Input Module designed for industrial distributed automation systems. This unit mounts onto a compatible terminal base unit without requiring direct field wiring to the module. Technicians can insert or remove the module under power to minimize operational interruption during maintenance. The module provides eight current-sinking digital input channels operating at 24V DC nominal voltage.
Each input channel accepts an on-state voltage ranging from 10V DC to 31.2V DC. The hardware exhibits an off-state voltage threshold of 5V DC and 1.5 mA maximum off-state current. Internal logic consumes 20 mA of Flexbus current at 5V DC backplane power. Maximum thermal power dissipation reaches 3.5 W under full load at 31.2V DC input potential.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Product Line | Flex I/O 1794 |
|---|
| UPC | 612598181285 |
|---|
| Weight | 0.50 lbs (0.23 kg) |
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| Inputs | 8 Current Sinking |
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| On-state Voltage min. | 10V DC |
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| On-state Voltage max. | 31.2V DC |
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| On-state Current min. | 2.0mA min. |
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| On-state Current max. | 12.0mA |
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| Off-state Voltage max. | 5V DC |
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| Off-state Current max. | 1.5mA |
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| Nominal Input Impedance | 4.6 k? |
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| Flexbus Current | 20mA @ 5V DC |
|---|
| Power Dissipation | 3.5W @ 31.2V DC max. |
|---|
TECHNICAL INFORMATION
Features
- Eight sinking 24V DC digital input channels.
- Removal and insertion under power capabilities reduce system downtime.
- Low backplane power draw of 20 mA at 5V DC.
- Channel status display via yellow light-emitting diode indicators.
- Wide on-state voltage operating window from 10V DC to 31.2V DC.
TECHNICAL INFORMATION
Connections / Interfaces
- Connects directly to the FLEX I/O terminal base backplane interface.
- Compatible with ControlNet, DeviceNet, EtherNet/IP, and Universal Remote I/O adapters.
TECHNICAL INFORMATION
Installation Guidelines
- Mount the supporting terminal base unit directly onto a standard DIN rail.
- Snap the 1794-IB8 module securely into the terminal base until locked.
- Field wiring terminates at the base unit rather than the removable module.
- Maintain ambient operating temperatures between 0 and 55 degrees Celsius.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley 1794-TB3 and 1794-TB3S terminal base units.
- Integrates into FLEX I/O communication networks via standard communication adapters.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley 1794-TB3 and 1794-TB3S terminal base units. Integrates into FLEX I/O communication networks via standard communication adapters.
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 base units are compatible with the 1794-IB8 module?
The 1794-IB8 operates with Allen-Bradley 1794-TB3 and 1794-TB3S terminal base units.
Can the 1794-IB8 be replaced while the system is powered?
Yes. The module supports removal and insertion under power because field wiring attaches directly to the terminal base.
What are the input voltage and current specifications for this module?
The nominal input voltage is 24V DC. On-state voltage spans 10 to 31.2V DC with 2.0 to 12.0 mA current.
