Get now the 1794-TB3S, the spring-clamp version of the versatile 3-wire terminal base for Allen-Bradley FLEX I/O modules. This unit combines the comprehensive wiring density of a 3-wire base with the high-reliability, low-maintenance benefits of spring-clamp technology.
What Is the 1794-TB3S?
The 1794-TB3S is a 36-terminal base unit designed for the FLEX I/O distributed system. It provides 16 I/O terminals, 16 power terminals, and 4 common terminals, making it perfectly suited for 3-wire field devices like proximity sensors that require separate power and ground. The standout feature is the «S» suffix, denoting spring-clamp (cage clamp) terminals. These terminals maintain a constant force on the wire, making the 1794-TB3S immune to the vibration-induced loosening that can plague traditional screw-clamp bases. This makes it a standard specification for machinery in the textile, automotive, and packaging industries where constant motion is a factor. It fully supports the modular architecture of the FLEX I/O system, including hot-swapping modules via RIUP.
Key Technical Specifications
- Terminal Type: Spring-clamp (Cage clamp)
- Number of Terminals: 36 (16 I/O, 16 Power, 4 Common)
- Current Capacity: 10A maximum
- Voltage Rating: 125V AC/DC
- FlexBus Current: 640mA
- Operating Temperature: 0 to 55 °C
- Wire Size: 0.34 to 2.5 mm² (22 to 12 AWG)
Enhanced Reliability and Installation
The 1794-TB3S is engineered to reduce lifecycle costs. The spring-clamp design not only speeds up the initial installation but also eliminates the need for periodic «retightening» of screws during preventative maintenance cycles. The architecture allows the base to stay permanently wired on the DIN rail while the electronic modules are updated or replaced. This separation of the wiring and the processing logic is a hallmark of the FLEX I/O system’s efficiency.
Expert Tips
To avoid damaging the spring mechanism, always use a dedicated terminal screwdriver (2.5mm or 3mm blade) and insert it straight into the actuation slot. For the most secure connection, avoid tinning the wire ends with solder; instead, use bare stranded wire or high-quality crimped ferrules. Solder can «cold flow» over time under the spring’s pressure, potentially leading to a higher-resistance connection.
Frequently Asked Questions
Q: Is the 1794-TB3S compatible with the same modules as the 1794-TB3?
A: Yes, they are functionally identical in terms of module compatibility and terminal mapping. The only difference is the physical spring-clamp versus screw-clamp mechanism.
Q: What is the benefit of the 16 power terminals?
A: They allow you to distribute 24V DC (or other control voltages) directly to each of your 16 sensors from the base itself, eliminating the need for external distribution terminal blocks.
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