The 1756-TBCH is a 36-pin removable screw terminal block (RTB) from Rockwell Automation's Allen-Bradley ControlLogix series.
It connects 1756 series I/O modules to field signal cables, centralizing field device wiring on the terminal block before inserting it into the front of the I/O module. This terminal block uses a screw-type (cage clip) wiring method, supports hot-plugging, and allows for quick replacement of I/O modules without disconnecting the cables, significantly simplifying system maintenance.
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Core Features
- ✓ 36-Pin High-Density Interface: Provides 36 wiring points, compatible with most ControlLogix digital/analog I/O modules.
- ✓ Removable Design (RTB): Supports hot-swapping, eliminating the need for rewiring when replacing I/O modules, significantly reducing downtime.
- ✓ Screw-Type Cage-Type Terminal Blocks: Employs a reliable screw crimping method, suitable for wire diameters of 14-24 AWG, torque 0.5 Nm.
- ✓ Mechanical Keying Anti-Misalignment: A keying design between the terminal block and the I/O module prevents incorrect insertion that could damage the module due to voltage errors.
Technical Specifications
| Brand |
Allen Bradley
|
| Model / Part Number |
1756-TBCH |
| Wiring Method |
Screw-type (Cage-Clamp) |
| Pin Count |
36 pins |
| Applicable Wire Gauge |
14-24 AWG (0.5 - 1.5 mm²) |
| Stripping Length |
10-12 mm |
| Rated Voltage |
30V DC |
| Rated Current |
2.8A |
| Torque Specification |
0.5 Nm (4.4 lb-in) |
| Operating Temperature |
-20°C to +60°C (some sources indicate -40 to +70°C) |
| Storage Temperature |
-40°C to +85°C |
| Protection Rating |
IP20 (some sources indicate IP67) |
| Mounting Method |
Directly plugged into the front of the I/O module; DIN rail assisted mounting supported |
| Dimensions (HxWxD) |
Approx. 8.9 x 8.4 x 3.3 cm |
Frequently Asked Questions
Q: What are the differences between 1756-TBCH and 1756-TBS6H? How to choose between them?
A: Both are 36-pin detachable terminal blocks. The main difference lies in the wiring method: 1756-TBCH uses a screw-type (cage clamp) connection, requiring a screwdriver to tighten the wires, suitable for applications requiring high vibration resistance or where screw wiring is preferred; 1756-TBS6H uses a spring-loaded connection, requiring only wire insertion, resulting in faster wiring and suitability for scenarios with frequent wiring changes. Both are essentially the same in terms of electrical specifications and compatibility.
Q: When using 1756-TBCH, can it be plugged and unplugged while the system is powered on?
A: Hot-swapping is supported, but environmental conditions must be considered. In non-hazardous locations, the terminal block can be plugged and unplugged directly while the system is powered on without disconnecting the power or stopping the controller, significantly reducing maintenance downtime. However, in hazardous locations (such as those containing explosive gases), hot-swapping may generate an electric arc, posing a hazard, and must be performed after power is disconnected or the environment is confirmed to be safe.
Q: Which I/O modules can the 1756-TBCH be used with?
A: It has wide compatibility and can be used with all 1756 series I/O modules that use a 36-pin interface, including digital input modules (such as 1756-IB32), digital output modules (such as 1756-OB32), analog modules, and high-speed counter modules (such as 1756-HSC). It is recommended to check the module's RTB compatibility specifications when purchasing.
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