Allen-Bradley 1797-TB3 – I/O Terminal Base Module | FLEX I/O Series
Engineering Background: The Allen-Bradley 1797-TB3 is a terminal base unit designed for use within Rockwell Automation’s FLEX I/O platform — a modular, distributed I/O architecture engineered for demanding industrial environments. The 1797 series terminal bases serve as the physical and electrical interface between the I/O adapter and individual I/O modules, enabling rapid field-side wiring and hot-swap module replacement without disrupting the control network.
Product Positioning: The 1797-TB3 is the standard 3-wire terminal base in the FLEX I/O family, providing screw-type field wiring terminals for signal, power, and common connections. It is the foundational mounting and wiring component for any 1797-series I/O module deployment, widely adopted in automotive, food & beverage, material handling, and process control applications globally.
Complete Technical Specifications
- Catalog Number: 1797-TB3
- Manufacturer: Allen-Bradley / Rockwell Automation
- Series: FLEX I/O (1797 Series)
- Module Type: I/O Terminal Base Module
- Wiring Style: 3-wire screw terminal (Signal, Power, Common)
- Terminal Type: Removable screw-clamp field wiring terminals
- Compatible I/O Modules: All 1797-series FLEX I/O modules
- Mounting: DIN rail (35 mm) or panel mount
- Backplane Connection: Integrated FLEX I/O backplane bus connector
- Operating Temperature: 0 °C to +60 °C (32 °F to 140 °F)
- Storage Temperature: -40 °C to +85 °C
- Relative Humidity: 5% to 95% non-condensing
- Vibration: IEC 68-2-6 compliant
- Shock: IEC 68-2-27 compliant
- Enclosure Rating: Open type (requires enclosure)
- Agency Certifications: UL Listed, CE Marked, CSA Certified
- Weight: Approx. 200 g
- Country of Origin: USA
Proven Application Environments
- Automotive Manufacturing: Body-in-white assembly lines, paint shop conveyors, and powertrain test cells utilizing distributed FLEX I/O nodes.
- Food & Beverage Processing: Hygienic production lines requiring modular I/O expansion with easy field wiring access and module swap capability.
- Material Handling & Logistics: Conveyor control panels, sortation systems, and warehouse automation with ControlNet or DeviceNet FLEX I/O adapters.
- Water & Wastewater Treatment: Remote I/O panels in pump stations and filtration systems where DIN rail mounting and compact footprint are critical.
- Discrete Process Control: Any PLC-based system using Allen-Bradley 1794 or 1797 FLEX I/O adapters requiring additional terminal base capacity.
Engineering Advantages
- Hot-Swap Capability: I/O modules can be inserted and removed from the 1797-TB3 base while the system remains powered, minimizing unplanned downtime during maintenance.
- Removable Terminal Blocks: Field wiring terminals detach from the base, allowing pre-wiring of replacement modules and zero-rewire module swaps.
- Compact DIN Rail Footprint: Slim profile enables high-density I/O configurations within standard control enclosures.
- Backplane Bus Integration: Seamless electrical connection to the FLEX I/O backplane ensures reliable data and power distribution across the I/O bank.
- Universal Module Compatibility: Accepts the full range of 1797-series digital and analog I/O modules without adapter hardware.
- Robust Industrial Construction: Rated for continuous operation in high-vibration, wide-temperature industrial environments per IEC standards.
System Architecture & Signal Flow
In a FLEX I/O system, the 1797-TB3 terminal base mounts on a 35 mm DIN rail and connects end-to-end with adjacent terminal bases via the integrated backplane bus. The FLEX I/O adapter (e.g., 1797-AENTR for EtherNet/IP) occupies the leftmost position and communicates with the PLC controller over the selected network. Each 1797-TB3 base accepts one I/O module on its top face; field device wiring connects to the screw terminals on the base. Power and common rails are distributed across the backplane, while I/O signal data is passed through the backplane bus to the adapter and upstream to the controller. This architecture supports up to 8 I/O modules per adapter node, with each terminal base contributing independently to the I/O map.
Sourcing & Quality Verification
- Source: Konmask.com sources 1797-TB3 units from verified surplus channels, authorized distributors, and factory-decommissioned control panels.
- Inspection Protocol: Each unit undergoes visual inspection for physical integrity, terminal condition, backplane connector alignment, and label legibility prior to listing.
- Authenticity: All units are verified against Rockwell Automation catalog markings. Counterfeit or non-OEM units are rejected at intake.
- Condition Disclosure: Product condition (New, Surplus New, Refurbished) is explicitly stated on each listing. Contact us if condition clarification is required before purchase.
- Warranty: 90-day functional warranty against defects in materials and workmanship. Extended warranty available upon request for volume orders.
Procurement Process
- Step 1 – Confirm Compatibility: Verify your FLEX I/O adapter model and I/O module catalog numbers to ensure 1797-TB3 is the correct terminal base for your configuration.
- Step 2 – Request a Quote: For orders of 5+ units or urgent delivery requirements, contact support@konmask.com for volume pricing and lead time confirmation.
- Step 3 – Place Order: Add to cart and complete checkout. HKD pricing displayed; multi-currency invoicing available for international B2B buyers.
- Step 4 – Shipping & Documentation: Orders ship within 1–3 business days. Commercial invoice, packing list, and test report provided upon request. DDP/DAP Incoterms available.
- Step 5 – Incoming Inspection: Upon receipt, verify catalog number label, terminal block condition, and backplane connector integrity before installation.
Technical FAQ
Q: Is the 1797-TB3 compatible with 1794 FLEX I/O modules?
A: No. The 1797-TB3 is designed exclusively for the 1797 FLEX I/O series. The 1794 series uses its own terminal base family (1794-TB series) with a different backplane connector form factor.
Q: Can the 1797-TB3 be used as a standalone wiring terminal without an I/O module installed?
A: The terminal base can be wired in advance, but it requires a 1797-series I/O module installed to function within the backplane data path. An empty base does not affect adjacent modules on the same backplane.
Q: What is the maximum number of 1797-TB3 bases per FLEX I/O adapter?
A: Up to 8 terminal bases (and corresponding I/O modules) per FLEX I/O adapter node, subject to the adapter’s power budget and I/O point limits.
Q: Does the 1797-TB3 support EtherNet/IP communication?
A: Communication protocol is determined by the FLEX I/O adapter, not the terminal base. The 1797-TB3 is protocol-agnostic and compatible with all 1797-series adapters including EtherNet/IP (1797-AENTR), ControlNet, and DeviceNet variants.
Q: Are replacement terminal blocks available separately?
A: Yes. Rockwell Automation offers replacement screw terminal blocks for the 1797-TB3. Contact Konmask for availability of spare terminal assemblies.
© 2026 Konmask.com. All rights reserved.
Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
