PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1794-TBNF is a FLEX I/O fused terminal base unit. It provides signal and power termination within the distributed FLEX I/O platform. The unit incorporates twenty screw clamp terminals arranged across two separate terminal strips. Terminal strip covers protect field wiring connections during operational use. Each terminal strip provides ten distinct connection points for field devices and power. Top connections handle I/O wiring alongside common points. Bottom connections accommodate complementary I/O wiring and DC or AC power.
The base unit features eight integrated slow-blow fuses sized at 5 by 20 mm. Each fuse carries an individual rating of 1.6 A at 250V AC. The terminal base accepts supply voltages across 24V, 120V, and 230V AC or DC circuits. It supports a maximum continuous current of 10 A across power terminals. FLEXBUS backplane current draw is rated at 640 mA at 5V DC. Field wiring to FLEXBUS isolation maintains a 250V continuous maximum rating.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Product Line | Flex I/O 1794 |
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| UPC | 612598137893 |
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| Weight | 0.56 lbs (0.26 kg) |
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| Terminal Screw Torque | 1.4 Nm |
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| Supply Voltage Range max. | 250V DC/AC, 50/60Hz, 10A |
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| Module Type | Terminal Base Unit |
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| Isolation Voltage | 250V Cotinuous max. |
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| No. of Terminal strips | Two (2) |
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| Voltage Rating | 24V DC/AC, 120V DC/AC, 230V DC/AC |
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| Connection type | Screw clamp |
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| Wire Size | 0.34-3.3mm^3 |
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| Terminal strip assignment | Top: I/O terminals / COM Bottom: I/O Terminals / +V |
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| I/O terminals | Sixteen (16) terminals |
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| Common / Supply terminals | Two (2) terminals each |
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| Daisy-chaining | Not supported |
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| Backplane current draw | 640 mA @ 5VDC |
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| Current rating | 10 Amperes |
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| Compatible Modules | 1794-OA8; 1794-OA8I;1794-OW8; 1794-OW8XT |
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TECHNICAL INFORMATION
Features
- Contains twenty screw clamp terminals divided across two ten-point terminal strips.
- Houses eight internal slow-blow fuses measuring 5 by 20 mm.
- Supports working voltages of 24V, 120V, and 230V AC or DC.
- Delivers continuous current handling up to 10 A.
- Draws 640 mA backplane current at 5V DC from the FLEXBUS.
- Provides up to 250V continuous isolation between field wiring and FLEXBUS.
- Includes an integrated keyswitch mechanism to prevent incorrect module insertion.
- Withstands operational shock of 30G and operational vibration of 5G.
TECHNICAL INFORMATION
Connections / Interfaces
- Terminals 0 through 14 on top provide I/O wiring connection points.
- Terminals 1 through 15 on bottom provide complementary I/O termination points.
- Terminals 16 and 33 serve as common (COM) power connections.
- Terminals 34 and 51 serve as positive voltage (+V) supply terminals.
- Accepts copper wire sizes from 0.34 to 3.3 mm² (22 to 12 AWG).
- Uses 1.4 Nm (12 lb-in) recommended tightening torque for screw terminals.
- Does not support daisy-chaining across base units.
TECHNICAL INFORMATION
Installation Guidelines
- Mount the terminal base onto a standard DIN rail or panel surface.
- Set the base keyswitch to the required module position before module insertion.
- Connect field wiring using stranded copper conductor rated at 75 degrees Celsius.
- Torque terminal clamp screws to exactly 1.4 Nm (12 lb-in).
- Ensure wire insulation thickness does not exceed 1.2 mm (3/64 in).
- Connect male and female FLEXBUS connectors firmly to adjacent FLEX I/O units.
- Maintain ambient operating temperatures between -20 and 55 degrees Celsius.
TECHNICAL INFORMATION
Compatibility
- Compatible with the Allen-Bradley 1794-OA8 non-isolated 8-channel output module.
- Compatible with the Allen-Bradley 1794-OA8I isolated 8-channel output module.
- Mounts the Allen-Bradley 1794-OW8 relay output module.
- Supports the Allen-Bradley 1794-OW8XT extended-temperature relay output module.
- Requires one 1794-TBNF terminal base unit per installed I/O module.
- Interconnects with adjacent FLEX I/O bases via male and female FLEXBUS connectors.
TECHNICAL INFORMATION
Compliance and Certifications
- Factory-designated T4A (North America) temperature code
- IEC T4 temperature code
- Open-style enclosure
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with the Allen-Bradley 1794-OA8 non-isolated 8-channel output module. Compatible with the Allen-Bradley 1794-OA8I isolated 8-channel output module. Mounts the Allen-Bradley 1794-OW8 relay output module. Supports the Allen-Bradley 1794-OW8XT extended-temperature relay output module. Requires one 1794-TBNF terminal base unit per installed I/O module. Interconnects with adjacent FLEX I/O bases via male and female FLEXBUS connectors.
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
Which modules are compatible with the Allen-Bradley 1794-TBNF?
The 1794-TBNF supports 1794-OA8, 1794-OA8I, 1794-OW8, and 1794-OW8XT output modules. Each module requires one base.
What fuse type and rating does the 1794-TBNF use?
It contains eight slow-blow fuses measuring 5 by 20 mm. Each fuse is rated 1.6 A at 250V AC.
What wire size and tightening torque are required for the 1794-TBNF?
The unit accepts 0.34 to 3.3 mm² copper wire. Screw terminals require 1.4 Nm (12 lb-in) torque.
What is the indicative market price for the 1794-TBNF?
Surplus observations indicate reference pricing around 48.00 USD. These figures are indicative market reference pricing only and are not a final quotation.
