Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Catalog Number | 1756-TBCH/A |
| Product Type | Removable Terminal Block (RTB) |
| Pin Count | 36-pin |
| Clamp Type | Cage-clamp |
| Housing | Standard (low-profile) |
| Screw Torque | 0.5 N·m (4.4 lb·in) |
| Single Wire Size | 0.33–2.1 mm² (22–14 AWG) |
| Double Wire Size | 0.33–1.3 mm² (22–16 AWG) |
| Wire Rating | Copper, 90 °C or greater |
| Compatibility | Most 1756 ControlLogix I/O modules |
4. Product Introduction (Anti-Template)
The Allen-Bradley 1756-TBCH/A is a 36-pin cage-clamp Removable Terminal Block designed for ControlLogix 1756 I/O modules. It plugs into the front of the module and provides the field-wiring interface, allowing plant wiring to be terminated independently of the module itself.
This RTB uses a cage-clamp design with a standard (low-profile) housing. It supports single-wire connections from 22–14 AWG and double-wire connections from 22–16 AWG. The recommended screw torque is 0.5 N·m. Because RTBs are ordered separately from the I/O modules, the 1756-TBCH is a frequently replaced spare in ControlLogix systems. It is the cage-clamp counterpart to the spring-clamp 1756-TBS6H and is widely used across digital, analog, and specialty 1756 modules that require a 36-pin terminal block.
1756-TBCH/A
1756-TBCH/A
1756-TBCH/A
1756-TBCH/A
1756-TBCH/A
5. QC, Procurement & Logistics SOP
- Inbound Verification – Confirm catalog number (1756-TBCH or 1756-TBCH/A), housing condition, and that all clamp screws are present and undamaged. Photograph labels.
- Visual Inspection – Check for cracked housing, bent pins, or missing screws. Verify the RTB seats properly on a sample module if available.
- QA & Packaging – Protect the pin contacts and clamp openings; pack in anti-static protective packaging to prevent damage during transit.
- Global Logistics & Export Compliance – Classify under the correct HS code for industrial terminal blocks / PLC accessories. Packaging must protect the contacts; export documentation is prepared to minimize customs delays.
6. Technical Pitfalls & Integration Warnings
Module Compatibility – Not every 1756 module uses the 36-pin TBCH. Confirm the required RTB type for the specific I/O module before ordering.
Wire Size Limits – Do not exceed the specified wire gauges or place more than two conductors on a single terminal (within the double-wire rating). Over-sizing can damage the clamps.
Torque – Apply only the specified 0.5 N·m torque. Over-tightening can strip the cage-clamp mechanism.
Housing Depth – The standard housing has limited depth. For larger wire or multiple conductors that require more space, the extended-depth housing (1756-TBE) may be needed.
7. Frequently Asked Questions (FAQ)
What is the realistic global lead time for a verified 1756-TBCH/A?
As a common ControlLogix accessory, stock is generally available. Typical lead time after verification is 3–10 business days plus standard shipping.
What type of terminal block is the 1756-TBCH?
A 36-pin cage-clamp Removable Terminal Block with standard housing.
Does it come with the I/O module?
No. RTBs are ordered separately from the ControlLogix I/O modules.
What wire sizes are supported?
Single wire: 22–14 AWG. Double wire: 22–16 AWG (copper, 90 °C or greater).
Is there a spring-clamp version?
Yes. The spring-clamp equivalent is the 1756-TBS6H.
What should be confirmed before ordering a replacement?
Exact catalog number (1756-TBCH or 1756-TBCH/A), the I/O module it will be used with, and whether standard or extended-depth housing is required.
