Allen-Bradley 1794-TB3S Terminal Base Unit

FAQ

Q1. What is the main function of 1794-TB3S?
It is a FLEX I/O terminal base used to connect field wiring to FLEX I/O modules and provide FlexBus backplane communication.

Q2. What does the “S” mean in TB3S?
It stands for Spring Clamp, meaning it uses cage-clamp terminals for faster wiring and better vibration resistance.

Q3. What is the difference between TB3 and TB3S?

• TB3: screw clamp terminals
• TB3S: spring clamp terminals (no screwdriver needed)

Q4. What modules are compatible with TB3S?
It is used with most FLEX I/O modules (digital, analog, relay, specialty), especially 16-point and 32-point types depending on configuration.

Q5. Does TB3S process signals?
No. It only provides wiring and backplane connection. All signal processing is done by the I/O module.

Q6. What is FlexBus?
FlexBus is the internal backplane that carries power and communication between the terminal base and the module.

Q7. Can modules be replaced while powered?
Yes, FLEX I/O supports RIUP (Removal and Insertion Under Power) depending on system design.

Q8. What environments is TB3S suitable for?
It is rated for standard industrial environments, typically -20 °C to 70 °C, and is widely used in machine and process automation systems.

1794-TB3S Allen Bradley

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