Introduction to the 1734-TBCJC Terminal Base
The Allen-Bradley 1734-TBCJC is a specialized Cold Junction Compensation (CJC) terminal base assembly designed for the POINT I/O™ modular platform. This component is essential when using thermocouple input modules, such as the 1734-IT2I, as it provides the critical temperature reference needed to ensure high-accuracy temperature measurements. By monitoring the temperature at the terminal connection point, the 1734-TBCJC allows the system to subtract the ambient thermal effect from the thermocouple signal.
Technical Features and Design
This terminal base features a built-in thermistor and integrated screw-clamp terminals. The compact, modular design allows it to snap onto a standard DIN rail, providing both the mechanical mounting and the electrical backplane connection (PointBus) for the associated I/O module. Its robust construction is engineered to withstand industrial environments, maintaining thermal stability even in cabinets with high component density.
Key Technical Specifications
- Base Type: Cold Junction Compensation (CJC) Terminal Base.
- Terminal Type: Screw-clamp.
- Field Wiring Terminals: 8 available points.
- Mounting: DIN Rail (horizontal or vertical).
- Operating Voltage: Up to 240V AC/DC.
- Thermal Reference: Integrated high-precision thermistor.
Operational Benefits
Using the 1734-TBCJC eliminates the need for external compensation circuitry, simplifying the wiring of temperature sensing loops. The screw-clamp design ensures a gas-tight connection, minimizing signal noise—a critical factor when dealing with millivolt signals from thermocouples. It is an indispensable part of process control systems in industries like food and beverage, pharmaceuticals, and heat treatment.
| Characteristic | Detail |
| Operating Temperature | -20°C to +55°C |
| Shock / Vibration | 30g / 5g @ 10-500Hz |
| Backplane Current | max 75 mA |
Frequently Asked Questions
Can I use this base with any module? It is specifically designed for thermocouple modules that require CJC. For standard I/O, use a 1734-TB or 1734-TBS base.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here.
This CJC terminal base is the mandatory interface for thermocouple sensing when using a 1734-AENTR network adapter.
