Allen-Bradley 1734-TBS I/O Terminal Block | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1734-TBS is a screw-type terminal block designed for use with the POINT I/O platform. It provides a reliable, field-wiring interface for POINT I/O modules, enabling secure signal connections in compact panel and machine-level control architectures. This page covers full technical specifications, compatible replacements, equivalent models, and a structured selection guide to help engineers specify the correct terminal block for their application.
Technical Specifications
- Part Number: 1734-TBS
- Manufacturer: Allen-Bradley / Rockwell Automation
- Series: POINT I/O
- Terminal Type: Screw-type terminal block
- Compatible Modules: POINT I/O 2-wire and 4-wire I/O modules
- Wire Range: 22–14 AWG (0.34–2.5 mm²)
- Torque Specification: 0.5–0.6 N·m (4.4–5.3 lb·in)
- Operating Temperature: -20°C to +60°C (-4°F to +140°F)
- Mounting: Pluggable, snaps onto POINT I/O module base
- Housing Material: Thermoplastic, UL 94V-0 rated
- Colour: Gray
- Certifications: UL, CE, cUL
- Weight: Approx. 20 g
Compatible Replacement & Equivalent Models
When the original 1734-TBS is unavailable or end-of-life, the following models are commonly evaluated as replacements. Always verify pin-out, wire gauge compatibility, and module series before substituting.
- 1734-TBSC – Spring-clamp variant of the 1734-TBS; same footprint, tool-free wiring. Preferred for high-vibration environments.
- 1734-TB3 – 3-wire screw terminal block for POINT I/O; suitable when additional wire positions are required per channel.
- 1734-TB3S – Spring-clamp version of the 1734-TB3; direct functional equivalent for 3-wire applications.
- 1734-TBX – Extended terminal block for POINT I/O modules requiring wider wire access.
- Third-party equivalents: Phoenix Contact and Weidmüller produce compatible pluggable terminal blocks with matching pitch; cross-reference by module catalog number and terminal pitch (5.08 mm) before ordering.
Note: Konmask.com supplies genuine Allen-Bradley parts. Third-party equivalents are listed for reference only. Contact us to confirm compatibility for your specific module.
Why Choose the Original Model
- Guaranteed fit: Factory-matched to POINT I/O module housings — no modification required.
- Validated torque specs: Rockwell-tested clamping force ensures long-term connection integrity under thermal cycling.
- UL/CE certified: Meets panel-builder and machine-safety compliance requirements out of the box.
- Spare parts continuity: Stocking genuine parts simplifies MRO procurement and avoids compatibility risk during emergency replacements.
- Warranty alignment: Using OEM terminal blocks preserves Rockwell Automation system warranty on associated I/O modules.
Typical Applications
- Field-wiring termination for POINT I/O digital input/output modules in machine control panels
- Discrete sensor and actuator wiring in automotive assembly lines
- Conveyor and material handling system I/O marshalling
- Packaging machine control cabinets using CompactLogix or MicroLogix with POINT I/O expansion
- Water/wastewater treatment panel I/O wiring where compact DIN-rail footprint is required
- Food and beverage processing lines requiring frequent terminal block removal for cleaning or module swap
System Compatibility
- Compatible PLC Platforms: CompactLogix (1769), MicroLogix, ControlLogix (via POINT I/O adapter)
- Compatible Adapters: 1734-AENT, 1734-AENTR, 1734-ADN, 1734-ADNX, 1734-APB
- Compatible I/O Modules: 1734-IB2, 1734-IB4, 1734-OB2E, 1734-OB4E, 1734-IA2, 1734-OA2, and other 2-wire POINT I/O modules
- Not compatible with: 1734-TB3 series modules (3-wire configuration) — use 1734-TB3 or 1734-TB3S instead
- DIN Rail: Standard 35 mm DIN rail via POINT I/O mounting base (1734-MB series)
Selection Guide
Use the following decision matrix to select the correct POINT I/O terminal block:
- 2-wire module + screw termination → 1734-TBS (this product)
- 2-wire module + spring-clamp termination → 1734-TBSC (high-vibration or fast-wiring applications)
- 3-wire module + screw termination → 1734-TB3
- 3-wire module + spring-clamp termination → 1734-TB3S
- Extended wire access needed → 1734-TBX
- Not sure? Identify your I/O module catalog number and check the module’s installation manual (Rockwell Publication 1734-IN series) for the correct terminal block suffix.
Key selection parameters: number of wires per channel (2 or 3), termination method preference (screw vs. spring), wire gauge range, and operating environment (vibration, temperature, ingress).
Quality Assurance & Sourcing
- Genuine OEM parts: All 1734-TBS units sourced through authorised Allen-Bradley / Rockwell Automation distribution channels.
- Inspection protocol: Each unit inspected for housing integrity, terminal continuity, and correct labelling prior to dispatch.
- Traceability: Batch records and certificates of conformance available on request for MRO and OEM customers.
- Anti-counterfeit: Konmask.com does not supply grey-market or refurbished terminal blocks. All parts ship with original manufacturer packaging where available.
- Lead time: In-stock items ship within 1–3 business days. Contact us for volume pricing and scheduled delivery.
How to Order
- Online: Add to cart directly from this page. Bulk quantity discounts available — contact us for a quote.
- Email: support@konmask.com — include part number, quantity, and required delivery date.
- Phone/WhatsApp: +0086 19859288691
- Lead time: Standard stock ships within 1–3 business days; expedited options available.
- Export: We ship globally. DDP, DAP, and EXW Incoterms supported. Contact us for customs documentation requirements.
Replacement & Compatibility FAQ
Q: Can I use the 1734-TBSC as a direct drop-in replacement for the 1734-TBS?
A: Yes — the 1734-TBSC uses the same footprint and module interface. The only difference is the spring-clamp termination method. No module or base modification is required.
Q: Is the 1734-TBS compatible with all POINT I/O modules?
A: No. The 1734-TBS is designed for 2-wire POINT I/O modules. For 3-wire modules, you must use the 1734-TB3 or 1734-TB3S. Always check the module’s installation manual for the correct terminal block catalog number.
Q: Can I mix screw-type and spring-clamp terminal blocks on the same POINT I/O bank?
A: Yes — each module has its own terminal block, so different termination types can coexist on the same DIN-rail bank without issue.
Q: What wire gauge is supported?
A: The 1734-TBS accepts 22–14 AWG (0.34–2.5 mm²) solid or stranded wire. Use ferrules for stranded wire to ensure consistent clamping force.
Q: Are third-party terminal blocks safe to use with POINT I/O modules?
A: Third-party blocks with matching pitch and pin-out may function electrically, but Rockwell Automation does not certify them. Using non-OEM terminal blocks may void module warranty and create compliance issues in safety-rated panels. Konmask.com recommends genuine Allen-Bradley parts for all production installations.
Q: How do I identify which terminal block my module needs?
A: Locate the module catalog number (e.g., 1734-IB2) and refer to the corresponding Rockwell publication (1734-IN001 series). The terminal block catalog number is listed in the wiring section.
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