Distributed I/O Solution – Allen-Bradley 1794-TB3K | Flex I/O Series
Where This Product Is Used
The Allen-Bradley 1794-TB3K Flex I/O Terminal Base Unit is deployed in distributed control architectures where field wiring must connect reliably to modular I/O adapters. Typical installation environments include:
- Automotive assembly lines – body-in-white welding cells, paint-shop conveyors, and end-of-line test stations requiring dense, panel-mounted I/O
- Food & beverage processing – hygienic zones where compact DIN-rail mounting reduces enclosure footprint and simplifies maintenance
- Water & wastewater treatment – remote pump stations and lift stations using DeviceNet or ControlNet distributed I/O drops
- Oil & gas upstream/midstream – wellhead RTU panels and compressor skids demanding vibration-resistant screw-clamp termination
- Pharmaceutical manufacturing – FDA-regulated lines where validated wiring integrity is non-negotiable
- Material handling & logistics – sortation systems and conveyor networks with high I/O point density per node
Technical Specifications
- Catalog Number: 1794-TB3K
- Series: Flex I/O (1794 Series)
- Manufacturer: Allen-Bradley / Rockwell Automation
- Terminal Type: 3-wire, screw-clamp (cage-clamp)
- Mounting: DIN rail (EN 50022, 35 mm) or panel mount
- Wire Range: 0.2 – 2.5 mm² (AWG 24–12)
- Operating Temperature: 0 °C to +60 °C (32 °F to 140 °F)
- Storage Temperature: –40 °C to +85 °C
- Relative Humidity: 5–95% non-condensing
- Vibration: IEC 68-2-6, 2 g @ 10–500 Hz
- Shock: IEC 68-2-27, 30 g
- Enclosure Rating: Open type (IP20 equivalent)
- Weight: Approx. 200 g
- Agency Certifications: UL, CE, CSA, C-Tick
Why Engineers Specify This Model
- Cage-clamp screw termination (TB3K) – the K suffix denotes cage-clamp screws that maintain consistent torque and resist vibration-induced loosening, reducing field callbacks
- 3-wire field wiring – supports sensor commons, signal, and power on a single terminal block row, eliminating jumper bars and simplifying loop drawings
- Hot-swap compatible – Flex I/O modules can be removed and replaced under power when used with an appropriate adapter, minimising unplanned downtime
- Compact 30 mm wide per node – allows high I/O density in space-constrained panels
- Universal adapter compatibility – mates with all 1794-series I/O modules (digital, analog, specialty) and communication adapters (DeviceNet, ControlNet, EtherNet/IP, PROFIBUS)
Complete System Bill of Materials
- 1794-TB3K – Terminal Base Unit (this item)
- 1794-ADN / 1794-ADNK – DeviceNet Adapter
- 1794-AENT – EtherNet/IP Adapter
- 1794-ACN15 – ControlNet Adapter
- 1794-IB16 – 16-point 24 VDC Digital Input Module
- 1794-OB16 – 16-point 24 VDC Digital Output Module
- 1794-IE8 – 8-channel Analog Input Module
- 1794-OE4 – 4-channel Analog Output Module
- 1794-CE1 – Right End Cap (required to terminate the I/O bank)
- DIN rail, 35 mm EN 50022 (customer-supplied)
Compliance & Industry Standards
- UL Listed (UL 508)
- CE Marked – EMC Directive 2014/30/EU & Low Voltage Directive 2014/35/EU
- CSA Certified (C22.2 No. 142)
- RoHS 2 Compliant (2011/65/EU)
- IEC 61131-2 – Programmable Controllers, Equipment Requirements
- ATEX / IECEx: Not rated for Zone 0/1 – use appropriate barriers for hazardous locations
Quality Assurance & Sourcing
Every 1794-TB3K unit supplied by Konmask.com is sourced through authorised distribution channels or verified surplus stock. Each unit undergoes:
- Visual inspection for housing cracks, terminal damage, and label integrity
- Continuity check on all screw-clamp terminals
- Firmware/revision verification against Rockwell Automation product change notices (PCNs)
- Anti-static packaging with humidity indicator card
Traceability documentation (date code, country of origin, revision letter) available upon request.
How to Source This Part
- In-stock orders: Add to cart – same-day dispatch for orders placed before 15:00 CST
- Bulk / project orders: Email support@konmask.com for volume pricing and lead-time commitment
- Urgent requirements: Call +0086 19859288691 for expedited sourcing
- Technical pre-sales: Our engineers can review your I/O architecture and confirm compatibility before purchase
Application-Specific FAQ
Q: Can the 1794-TB3K be used with EtherNet/IP adapters?
A: Yes. It mates with the 1794-AENT and all other 1794-series communication adapters without modification.
Q: What is the maximum number of terminal bases per adapter?
A: Up to 8 I/O modules per Flex I/O adapter, subject to the adapter current budget.
Q: Is the TB3K compatible with the older TB3 terminal base?
A: Both accept the same I/O modules. The TB3K uses cage-clamp screws for improved vibration resistance; they are mechanically interchangeable in the same I/O bank.
Q: What wire ferrule size is recommended?
A: 1.5 mm² (AWG 16) bootlace ferrules for signal wiring; 2.5 mm² (AWG 12) for power commons.
Q: Does Konmask provide a warranty?
A: Yes – 12-month warranty against defects. Replacement or full refund within the warranty period.
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Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
