Product Overview

The Allen-Bradley 1756-TBCH is a 36-pin Removable Terminal Block (RTB) specifically engineered for the ControlLogix® 1756 I/O platform. This essential interface component provides a modular bridge between field-side wiring and the I/O module electronics. By utilizing an RTB architecture, the 1756-TBCH allows for the complete replacement of I/O modules without the need to disconnect or disturb existing field wiring. This "plug-and-play" capability significantly reduces mean time to repair (MTTR) and minimizes the risk of wiring errors during system maintenance or hardware upgrades.

This module features a cage clamp termination method, which provides a secure, vibration-resistant connection for high-density I/O configurations. The 1756-TBCH is designed to seat firmly into the front of the I/O module, secured by mounting screws to ensure electrical continuity in demanding industrial environments.

Wiring and Mechanical Specifications

The 1756-TBCH is designed to accommodate a variety of conductor types and sizes, ensuring compatibility with standard industrial wiring practices.

• Termination Type: Cage clamp screw terminals for rapid and secure wire retention.

• Pin Configuration: 36-pin high-density layout optimized for 16-channel and 32-channel I/O modules.

• Single Wire Capacity: Supports 0.33 mm² to 2.1 mm² (22 to 14 AWG) solid or stranded copper wire.

• Double Wire Capacity: Supports up to two 0.33 mm² to 1.3 mm² (22 to 16 AWG) wires per terminal.

• Torque Requirement: Recommended terminal screw torque of 0.5 Nm (4.4 lb-in) to ensure optimal contact pressure.

• Wire Insulation Rating: Compatible with copper conductors rated for 90°C (194°F) or higher.

Technical Specifications

• Manufacturer: Allen-Bradley (Rockwell Automation)

• Model Number: 1756-TBCH

• Module Type: Removable Terminal Block (RTB)

• Number of Pins: 36 Pins

• Environmental Rating: IP20 (with housing)

• Operating Temperature: 0°C to 60°C (32°F to 140°F)

• Operational Shock: 30g

• Vibration Resistance: 2g @ 10 to 500 Hz

• Dimensions: 11.6 x 3.3 x 4.7 cm

• Weight: 0.14 kg (0.31 lbs)

Compatibility and Industrial Application

The 1756-TBCH is a universal accessory for the ControlLogix series, supporting a vast array of digital and diagnostic modules.

• Digital Input Modules: Compatible with 1756-IA16I, 1756-IB16D, 1756-IB16I, and 1756-IH16I.

• Digital Output Modules: Compatible with 1756-OB16D, 1756-OB16E, and 1756-OB16IEF.

• Specialty Modules: Supports various isolated and diagnostic-capable 1756 modules requiring 36-pin termination.

• Ease of Maintenance: The integrated locking tabs allow for the block to be removed from the module in seconds, facilitating rapid commissioning and troubleshooting of field circuits.