Distributed I/O Solution – Allen-Bradley 1794-TB2 | FLEX I/O Series
Where This Product Is Used
The Allen-Bradley 1794-TB2 FLEX I/O Terminal Base Unit is a foundational wiring interface component deployed across a wide range of industrial automation environments. Engineers specify this module wherever distributed I/O architecture is required — eliminating centralized wiring runs and reducing panel footprint.
Typical deployment environments include:
- Automotive Assembly Lines — Body-in-white welding stations, paint shop conveyors, and end-of-line test rigs where distributed I/O nodes reduce cable tray congestion.
- Food & Beverage Processing — Bottling lines, pasteurization systems, and packaging machines requiring hygienic, compact I/O mounting close to field devices.
- Water & Wastewater Treatment — Pump stations, filtration skids, and SCADA-connected remote I/O panels where the FLEX I/O platform provides reliable field-level communication.
- Oil & Gas Upstream/Midstream — Wellhead control panels, compressor skids, and pipeline monitoring stations using ControlNet or DeviceNet backbones.
- Pharmaceutical Manufacturing — Validated batch processing lines and clean-room environments where modular I/O supports 21 CFR Part 11 compliant control architectures.
- Material Handling & Logistics — Sortation systems, conveyor networks, and automated storage/retrieval systems (AS/RS) with distributed sensor/actuator nodes.
- Machine Tool & OEM Equipment — CNC machining centers, press lines, and custom OEM machines integrating FLEX I/O for compact, rail-mounted I/O expansion.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 1794-TB2 |
| Series | FLEX I/O |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Module Type | Terminal Base Unit (2-screw) |
| Wiring Style | 2-wire per point (screw terminal) |
| Compatible I/O Modules | 1794-series FLEX I/O modules |
| Mounting | DIN rail (35 mm) |
| Operating Temperature | 0 °C to +55 °C |
| Storage Temperature | -40 °C to +85 °C |
| Relative Humidity | 5% to 95% (non-condensing) |
| Weight | Approx. 200 g |
| Certifications | UL, CE, CSA |
Why Engineers Specify This Model
- Proven FLEX I/O Ecosystem — The 1794-TB2 is the standard 2-screw terminal base across the entire FLEX I/O module family, ensuring broad compatibility with digital, analog, and specialty I/O modules.
- Simplified Field Wiring — Screw-terminal design allows direct field-device connections without additional terminal blocks, reducing BOM cost and wiring labor.
- Hot-Swap Module Replacement — I/O modules can be removed and replaced without disturbing field wiring, minimizing downtime during maintenance or module upgrades.
- Compact DIN-Rail Footprint — Slim profile enables high-density I/O configurations in space-constrained panels and junction boxes.
- Long Product Lifecycle — Part of Rockwell Automation’s long-standing FLEX I/O platform with broad installed base and sustained spare-parts availability.
- Network Agnostic — Works with FLEX I/O adapters supporting ControlNet, DeviceNet, EtherNet/IP, PROFIBUS, and Remote I/O, making it suitable for multi-protocol plant architectures.
Complete System Bill of Materials
A fully operational FLEX I/O node using the 1794-TB2 typically includes the following components:
| Part Number | Description | Role in System |
|---|---|---|
| 1794-TB2 | Terminal Base Unit (2-screw) | Field wiring interface — this product |
| 1794-ADN | DeviceNet Adapter | Network communication adapter |
| 1794-ACN15 | ControlNet Adapter | ControlNet communication adapter |
| 1794-AENT | EtherNet/IP Adapter | Ethernet communication adapter |
| 1794-IB16 | 16-Point 24VDC Digital Input Module | Digital input I/O module |
| 1794-OB16 | 16-Point 24VDC Digital Output Module | Digital output I/O module |
| 1794-IE8 | 8-Channel Analog Input Module | Analog input I/O module |
| 1794-PS1 | Power Supply — 3A | FLEX I/O bus power supply |
| 1794-TB3 | Terminal Base Unit (3-screw) | Alternative terminal base for higher-density wiring |
Compliance & Industry Standards
- UL Listed — Meets UL 508 Industrial Control Equipment standards.
- CE Marked — Compliant with EU Low Voltage Directive and EMC Directive for European market deployment.
- CSA Certified — Approved for Canadian industrial installations per CSA C22.2.
- RoHS Compliant — Manufactured in accordance with EU Directive 2011/65/EU restricting hazardous substances.
- IEC 61131-2 — Compatible with programmable controller I/O module standards for international project specifications.
Quality Assurance & Sourcing
Konmask.com sources the 1794-TB2 through verified industrial automation supply channels. Every unit undergoes the following quality process before shipment:
- Visual inspection for physical damage, label integrity, and terminal condition.
- Verification of part number, revision level, and date code against order specifications.
- Functional continuity check on terminal connections.
- Anti-static packaging with moisture barrier for safe international transit.
- Certificate of conformance available upon request for regulated industries.
We supply both new original and factory-refurbished units. Condition is clearly stated on each listing. Refurbished units carry a 90-day replacement warranty.
How to Source This Part
To request a quote or confirm availability for the 1794-TB2:
- Email: support@konmask.com
- Phone / WhatsApp: +0086 19859288691
- Website: https://konmask.com
Please include your required quantity, acceptable condition (new / refurbished), and any revision-level requirements. Bulk orders and project BOM sourcing are welcome.
Application-Specific FAQ
Q: Can the 1794-TB2 be used with any FLEX I/O module?
A: Yes. The 1794-TB2 is the universal 2-screw terminal base compatible with all standard 1794-series I/O modules. Verify module-specific wiring requirements in the module’s installation instructions.
Q: What is the difference between 1794-TB2 and 1794-TB3?
A: The TB2 provides 2 screw terminals per I/O point, while the TB3 provides 3 terminals per point (signal + 2 commons), offering more flexibility for complex field wiring. Choose TB3 when additional common connections per point are required.
Q: Is the 1794-TB2 compatible with EtherNet/IP adapters?
A: Yes. The terminal base is network-agnostic — it interfaces with the I/O module regardless of which adapter (DeviceNet, ControlNet, EtherNet/IP, etc.) is used on the FLEX I/O node.
Q: Can I replace a module without shutting down the system?
A: The FLEX I/O platform supports hot-swap of I/O modules on the terminal base. Field wiring remains connected to the TB2 during module removal and replacement, minimizing process interruption.
Q: Do you supply 1794-TB2 for urgent/emergency orders?
A: Yes. Contact us via WhatsApp (+0086 19859288691) for expedited sourcing. We maintain stock of common FLEX I/O components for fast dispatch.
Q: What revision levels are available?
A: Available revision levels depend on current stock. Please specify your revision requirement when inquiring, and we will confirm availability or suggest a compatible alternative.
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Contact: support@konmask.com | +0086 19859288691
