Purchase now the 1794-TB2, a fundamental component of the Allen-Bradley FLEX I/O system designed to provide a secure and efficient mounting platform for I/O modules. This terminal base unit facilitates the connection of field wiring while allowing for modular flexibility in distributed control architectures.
What Is the 1794-TB2?
The 1794-TB2 is a high-performance terminal base unit that serves as the physical interface between FLEX I/O modules and the field devices. It consists of a mounting base for the I/O module and a terminal strip for field wiring. The 1794-TB2 is specifically designed for 2-wire applications, featuring 16 I/O terminals and 2 common terminals. This architecture allows for a «Removal and Insertion Under Power» (RIUP) capability, which means you can swap out modules without disrupting the power or communication to the rest of the rack. This significantly reduces downtime during maintenance or system upgrades in continuous industrial processes.
Key Technical Specifications
- Terminal Type: Screw-clamp
- Number of Terminals: 18 (16 I/O, 2 Common)
- Current Capacity: 10A maximum
- Voltage Rating: 125V AC/DC
- FlexBus Current: 640mA
- Wire Size: 0.34…2.5 mm² (22…12 AWG)
- Dimensions: 94 x 94 x 69 mm
System Integration and Compatibility
The 1794-TB2 is compatible with a wide range of FLEX I/O digital and analog modules. It is engineered to snap onto a standard DIN rail or be panel-mounted. The internal bus communication (FlexBus) passes through the base, allowing multiple units to be connected side-by-side to form a complete I/O station controlled by a single communication adapter (such as EtherNet/IP, ControlNet, or DeviceNet).
Installation Advice
When installing the 1794-TB2, ensure the keyswitch on the base is correctly positioned before snapping the I/O module into place. For the 1794-TB2, the keyswitch prevents the insertion of incompatible modules that could cause hardware damage. Always use a small flat-head screwdriver for the terminal screws to ensure a torque of 0.5-0.8 Nm, preventing loose connections in high-vibration environments.
Frequently Asked Questions
Q: Can I use the 1794-TB2 with 3-wire sensors?
A: No, the 1794-TB2 is designed for 2-wire devices. If you need to connect 3-wire sensors that require an additional power terminal per point, you should use the 1794-TB3 base instead.
Q: Does this base support analog modules?
A: Yes, it is compatible with various analog modules, provided the pin configuration of the module matches the terminal layout of the base. Check the module manual for specific wiring diagrams.
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