Allen-Bradley 1794-TB3S FLEX I/O Terminal Base Unit – FLEX I/O Series
Imagine a production line grinding to a halt — not because of a failed motor or a broken conveyor, but because a single terminal base unit has failed, severing the communication link between your I/O modules and the control backplane. Without the 1794-TB3S, field wiring has no structured interface to the FLEX I/O system, leaving sensors and actuators electrically isolated and your process blind. Unplanned downtime in discrete manufacturing or process control can cost thousands of dollars per hour. The Allen-Bradley 1794-TB3S is the foundational wiring interface that keeps your FLEX I/O architecture intact and your plant running.
Within the Allen-Bradley 1794 FLEX I/O family, the 1794-TB3S occupies a critical infrastructure role: it is the 3-wire screw terminal base unit designed to accept a single FLEX I/O module and provide a robust, field-wiring termination point. Unlike adapter-only or bus-only components, the TB3S integrates the module mounting slot, the backplane bus connection, and the field-side screw terminals into one compact unit. Globally, the FLEX I/O platform is one of Rockwell Automation’s most widely deployed distributed I/O solutions, trusted in automotive assembly, food & beverage processing, oil & gas, and water treatment facilities across more than 80 countries.
Technical Specifications
- Part Number: 1794-TB3S
- Series: Allen-Bradley FLEX I/O (1794 Series)
- Terminal Type: 3-wire screw terminal
- Module Slots: 1 (accepts one 1794 I/O module)
- Backplane Bus: FLEX I/O backplane compatible
- Wiring Style: Individual screw terminals per I/O point
- Mounting: DIN rail or panel mount via FLEX I/O adapter
- Manufacturer: Rockwell Automation / Allen-Bradley
- Product Family: 1794 FLEX I/O
Note: Specifications are based on published Rockwell Automation documentation. Always verify against the official product datasheet for your specific application requirements.
Key Features & Benefits
- 3-Wire Screw Terminal Design: Provides individual signal, power, and common terminals per I/O point, simplifying field wiring and reducing mis-wiring risk in dense panel environments.
- Single-Module Slot Architecture: Each TB3S accepts exactly one 1794 I/O module, enabling granular, modular expansion of your distributed I/O network without over-committing rack space.
- Backplane Bus Integration: Seamlessly connects to the FLEX I/O backplane, ensuring reliable high-speed data transfer between field devices and the communication adapter.
- Compact Form Factor: Optimized for space-constrained control panels and distributed I/O drops, reducing cabinet footprint without sacrificing wiring accessibility.
- Tool-Assisted Wiring: Screw terminals accommodate standard ferrule-terminated conductors, supporting IEC wiring practices common in international industrial installations.
- Hot-Swap Compatible: When used within a properly configured FLEX I/O system, supports module removal and insertion without full system shutdown (subject to system configuration).
- Wide Industry Acceptance: Proven in millions of I/O points globally across safety-critical and high-availability applications.
Industry & Equipment Applications
- Automotive Manufacturing: Body welding lines, paint shop conveyors, and assembly station I/O drops where distributed architecture reduces home-run cabling costs.
- Food & Beverage Processing: Hygienic production lines requiring compact, reliable I/O termination in wash-down adjacent control panels.
- Oil & Gas: Remote I/O drops in wellhead control panels and pipeline monitoring stations using ControlLogix or CompactLogix backbones.
- Water & Wastewater Treatment: Distributed pump station control where FLEX I/O nodes interface with DeviceNet or EtherNet/IP adapters.
- Pharmaceutical & Life Sciences: Validated automation systems requiring traceable, documented I/O infrastructure with clear terminal identification.
- Material Handling & Logistics: Sorter systems, conveyor networks, and automated storage/retrieval systems (AS/RS) with high I/O point density.
- Building Automation & HVAC: Large-scale BMS integrations leveraging FLEX I/O for analog and digital field device termination.
System Integration & Compatible Parts
The 1794-TB3S is designed to work within the broader Allen-Bradley 1794 FLEX I/O ecosystem. Key compatible components include:
- Communication Adapters: 1794-AENT (EtherNet/IP), 1794-ADN (DeviceNet), 1794-APB (PROFIBUS DP), 1794-ACN15 (ControlNet)
- Digital I/O Modules: 1794-IB16, 1794-OB16, 1794-IA16, 1794-OA16 and related discrete modules
- Analog I/O Modules: 1794-IE8, 1794-OE4, 1794-IE4XOE2 and related analog modules
- Controllers: Allen-Bradley ControlLogix (1756), CompactLogix (1769), and MicroLogix platforms via appropriate adapters
- Related Terminal Bases: 1794-TB3, 1794-TB3G, 1794-TB32, 1794-TBN for alternative wiring configurations
- Power Supplies: 1794-PS13, 1794-PS1 for FLEX I/O system power
Contact our technical team to confirm compatibility with your specific system architecture before ordering.
Our Quality Assurance Process
At Konmask.com, every Allen-Bradley 1794-TB3S unit we supply undergoes a structured verification process before shipment:
- Source Verification: Units are sourced from authorized distributors, certified resellers, or directly from Rockwell Automation supply chains with full traceability documentation.
- Visual & Physical Inspection: Each unit is inspected for label integrity, terminal condition, backplane connector alignment, and housing damage.
- Authenticity Check: Holographic labels, date codes, and serial number formats are verified against Rockwell Automation’s published authentication guidelines.
- Functional Testing (where applicable): Refurbished or surplus units undergo bench testing in a live FLEX I/O test rack prior to listing.
- Packaging & ESD Protection: Units are packed in anti-static bags with appropriate cushioning to prevent transit damage to sensitive backplane connectors.
- Documentation: Certificate of conformity and inspection records available upon request for regulated industries.
How to Order
- Submit an Inquiry: Use the contact form on this page or email support@konmask.com with your required quantity and delivery timeline.
- Receive a Quote: Our team will respond within 1 business day with pricing, availability, and lead time confirmation.
- Order Confirmation: Upon agreement, we issue a proforma invoice. Payment terms are confirmed at this stage.
- Shipment & Tracking: Orders are dispatched via DHL, FedEx, or UPS Express with full tracking. Export documentation provided for international shipments.
- After-Sales Support: Our technical team remains available post-delivery for integration questions or warranty claims.
For urgent requirements or large-volume orders, please call us directly at +0086 19859288691.
Why Choose Konmask.com?
- Industrial Automation Specialists: We focus exclusively on PLC, DCS, and industrial automation components — not a generalist marketplace.
- Global Sourcing Network: Access to both current-production and legacy/obsolete parts that OEM channels no longer stock.
- Technical Pre-Sales Support: Our engineers can review your BOM, confirm compatibility, and advise on alternative part numbers when needed.
- Fast International Shipping: Experienced in export compliance, customs documentation, and time-critical deliveries to over 50 countries.
- Transparent Traceability: Full supply chain documentation available for regulated industries including pharma, oil & gas, and defense.
- Competitive Pricing: Direct relationships with distributors and surplus dealers allow us to offer market-competitive pricing without compromising authenticity.
Frequently Asked Questions
Q: What is the difference between the 1794-TB3S and the 1794-TB3?
A: Both are 3-wire terminal base units for the FLEX I/O system. The 1794-TB3S is the standard screw terminal version, while the 1794-TB3 may differ in terminal configuration or spring-clamp options depending on the revision. Always verify the exact part number suffix against your system documentation.
Q: Can the 1794-TB3S be used with any 1794 I/O module?
A: The 1794-TB3S is designed to accept standard 1794 series I/O modules. However, some specialty modules may require specific terminal base configurations. Consult the module’s installation instructions to confirm terminal base compatibility.
Q: Do you supply new, refurbished, or surplus units?
A: We supply new, factory-sealed units as primary stock. Refurbished and tested-surplus units are available when new stock lead times are extended. The condition is clearly stated in your quotation.
Q: What is the lead time for the 1794-TB3S?
A: In-stock units typically ship within 2–3 business days. For larger quantities or special sourcing requirements, lead times are confirmed at the quotation stage.
Q: Can you provide export documentation for international orders?
A: Yes. We provide commercial invoices, packing lists, certificates of origin, and certificates of conformity as required. We are experienced in shipping to Asia, Europe, the Middle East, and the Americas.
Q: Is the 1794-TB3S still in production?
A: Rockwell Automation product lifecycle status changes periodically. Contact our team for the latest availability and any recommended migration paths if the product has reached end-of-life status.
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