Discrete I/O Wiring Solution — Allen-Bradley 1756-TBS6H | ControlLogix RTB Series
Where This Product Is Used
The Allen-Bradley 1756-TBS6H Removable Terminal Block (RTB) is the field-wiring interface for ControlLogix digital I/O modules. It is specified across a broad range of industrial environments where reliable, maintainable, and high-density discrete signal termination is required:
- Automotive Assembly Lines — Terminating proximity sensors, limit switches, and solenoid outputs on body-in-white and powertrain lines.
- Oil & Gas Processing Plants — Field instrument wiring on wellhead control panels and compressor skids where module hot-swap capability is critical.
- Water & Wastewater Treatment — Pump run/fault status and valve open/close feedback wiring in SCADA-integrated control panels.
- Food & Beverage Production — Conveyor, filling, and packaging machine I/O termination in washdown-adjacent control enclosures.
- Pharmaceutical Manufacturing — Validated control systems requiring documented, traceable field-wiring connections.
- Building Automation & HVAC — Fan, damper, and chiller status I/O in BAS panels using ControlLogix as the primary controller.
- Power Generation & Utilities — Breaker status, trip coil, and auxiliary contact wiring in substation automation panels.
Technical Specifications
| Part Number | 1756-TBS6H |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Series | ControlLogix RTB (Removable Terminal Block) |
| Terminal Count | 36 Pins |
| Connection Type | Screw-clamp (cage clamp style) |
| Compatible Modules | 1756-IB16, 1756-OB16E, 1756-IA16, 1756-OA16, and other 36-pin ControlLogix I/O modules |
| Wire Gauge Range | 22–14 AWG (0.34–2.08 mm²) |
| Mounting | Plugs directly onto compatible 1756 I/O module face |
| Housing Material | UL 94V-0 rated thermoplastic |
| Weight | 150 g (approx.) |
| Country of Origin | USA (Rockwell Automation) |
Why Engineers Specify This Model
- Hot-Swap Field Wiring — The RTB design allows the I/O module to be removed from the chassis without disturbing field wiring, minimizing downtime during module replacement or maintenance.
- 36-Pin High Density — Accommodates all signal, common, and power terminals for 16-point I/O modules in a single compact connector, reducing panel footprint.
- Screw-Clamp Reliability — Screw terminals provide vibration-resistant, gas-tight connections preferred in industrial environments over spring-cage alternatives for high-cycle applications.
- Keyed Connector Body — Physical keying prevents incorrect module-to-RTB mating, eliminating mis-wiring risk during maintenance.
- OEM & MRO Interchangeability — Direct Rockwell Automation catalog replacement; no re-engineering required for existing panel designs.
- Labeling Strip Compatible — Accepts standard ControlLogix RTB label inserts for clear, auditable field-wire identification.
Complete System Bill of Materials
The 1756-TBS6H is typically ordered alongside the following ControlLogix components for a complete I/O subsystem:
- 1756-A7 / 1756-A13 / 1756-A17 — ControlLogix chassis (7, 13, or 17 slot)
- 1756-PA72 / 1756-PB72 — ControlLogix power supply (120/240 VAC or 18–32 VDC)
- 1756-L8x / 1756-L7x — ControlLogix 5580 or 5570 controller
- 1756-IB16 / 1756-OB16E — 16-point 24 VDC sink input / source output modules (primary RTB consumers)
- 1756-IA16 / 1756-OA16 — 16-point 120 VAC input / output modules
- 1756-TBS6H — This RTB (qty per I/O module count)
- 1492-CABLE series — Pre-wired interface cables (alternative to direct field wiring)
Compliance & Industry Standards
- UL Listed (UL 508 Industrial Control Equipment)
- CE Marked — EMC Directive 2014/30/EU & Low Voltage Directive 2014/35/EU
- RoHS Compliant — Directive 2011/65/EU
- cUL Listed (Canadian market)
- Designed and tested to IEC 61131-2 (Programmable Controllers — Equipment Requirements)
- Compatible with ATEX Zone 2 installations when used with approved 1756 I/O modules and enclosures
Quality Assurance & Sourcing
Konmask.com sources Allen-Bradley components exclusively through verified industrial distribution channels. Every unit offered is:
- Inspected for original Rockwell Automation packaging and holographic authenticity labels
- Verified against Rockwell Automation catalog revision records
- Stored in ESD-safe, climate-controlled warehousing
- Shipped with original manufacturer documentation where available
- Backed by Konmask’s 90-day quality guarantee on all stocked components
We do not source from grey-market or unverified secondary channels. Counterfeit risk is actively mitigated at every procurement stage.
How to Source This Part
- In Stock Orders — Add to cart and check out directly. Same-day dispatch available for orders placed before 15:00 CST on business days.
- Bulk / Project Quantities — Contact support@konmask.com for volume pricing and project BOM support.
- Urgent / Emergency MRO — Call or WhatsApp +0086 19859288691 for expedited sourcing and same-day quotation.
- OEM Panel Builders — Request a standing purchase agreement for recurring RTB quantities tied to production schedules.
- International Shipping — We ship to Southeast Asia, the Middle East, Europe, and North America. DDP (Delivered Duty Paid) terms available on request.
Application-Specific FAQ
Q: Is the 1756-TBS6H compatible with all ControlLogix I/O modules?
A: No — it is specifically designed for 36-pin ControlLogix I/O modules (typically 16-point digital modules). Analog modules and some specialty modules use different RTB form factors (e.g., 1756-TBCH or 1756-TBNH). Always verify the module’s catalog page for the correct RTB part number.
Q: Can I reuse the RTB when replacing a failed I/O module?
A: Yes. This is the primary design intent of the RTB system. The terminal block remains in place with all field wiring intact; only the I/O module is removed and replaced. This reduces MTTR (Mean Time To Repair) significantly on the plant floor.
Q: What is the maximum wire size I can terminate in the 1756-TBS6H?
A: The screw terminals accept up to 14 AWG (2.08 mm²) solid or stranded wire. For high-current output applications, verify that the I/O module’s output current rating — not the RTB — is the limiting factor.
Q: Do I need a separate RTB for each I/O module in my chassis?
A: Yes. Each I/O module requires its own dedicated RTB. For a fully populated 13-slot chassis with 12 I/O modules, you would require 12 × 1756-TBS6H (or the appropriate RTB variant per module type).
Q: Is this part still in active production by Rockwell Automation?
A: The 1756-TBS6H is an active catalog item. However, availability can fluctuate with global supply chain conditions. Konmask maintains buffer stock specifically to support MRO and emergency procurement needs.
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Contact: support@konmask.com | +0086 19859288691
