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Description
The 1794-TB3T is a 36-point screw-clamp terminal base unit designed for the Allen-Bradley Flex I/O 1794 modular platform. This unit provides the necessary structural and electrical termination plane for both discrete and analog I/O modules. The "T" suffix denotes a temperature-optimized design, featuring eight integrated chassis-ground screw terminals specifically engineered to provide low-impedance paths for shielding sensitive analog instrumentation, such as RTDs and thermocouples, effectively mitigating electromagnetic interference (EMI).
Features
- Integrated chassis grounding architecture with 8 dedicated ground terminals for noise-sensitive applications.
- Supports up to 16 field I/O connections with heavy-duty screw-clamp terminals.
- Integrated Flexbus backplane for seamless data and logic power distribution.
- Mechanical keyswitch guide to prevent improper module installation and protect low-voltage components.
- Capable of handling up to 10 A aggregate current.
- Compatible with both horizontal and vertical DIN-rail or panel mounting.
Applications
This terminal base is ideal for industrial control systems requiring high-precision analog signal processing where signal integrity is paramount. It is commonly used in process automation, temperature monitoring loops, and environments prone to electrical noise where robust grounding and shield termination are required for reliable operation.
Technical Specifications
| Model |
1794-TB3T |
| Brand |
Allen-Bradley / Rockwell Automation |
| Terminal Type |
Screw-Clamp |
| Field Connections |
16 I/O points |
| Ground Terminals |
8 dedicated chassis ground |
| Max Voltage |
125 VAC / 125 VDC |
| Max Current |
10 A aggregate |
| Operating Temperature |
-20 to 70 degC |
| Vibration Resistance |
5 g at 10 to 150 Hz |
| Humidity |
5 to 95 percent (non-condensing) |
Installation Guidelines
- Ensure the DIN-rail or panel is properly grounded to the enclosure chassis before mounting.
- Verify the mechanical keyswitch on the base matches the keying of the inserted I/O module to prevent damage.
- Always power down the Flexbus backplane before installing or removing I/O modules to prevent electrical arcing.
- Route shielded cables directly to the dedicated chassis ground terminals to maximize noise immunity.
- Maintain adequate spacing in the enclosure to allow for proper airflow and heat dissipation.
FAQ
What is the primary difference between the 1794-TB3 and the 1794-TB3T?
The 1794-TB3T includes specialized chassis-grounding terminals designed for temperature-sensing applications, whereas the standard 1794-TB3 does not include these specific grounding points.
Can this base be used with non-analog modules?
Yes, the 1794-TB3T is fully compatible with standard discrete digital Flex I/O modules, though the grounding features are specifically intended for analog signal applications.
