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FLEX I/O 3-Wire Screw Terminal Base Unit, 16 I/O
18 common terminals, 18 +V terminals, Primarily intended
for use with input modules when using 3-wire input
proximity switches – can also be used with output modules
The 1794-TB3 is the FLEX I/O 3-wire screw-clamp terminal base unit that serves as the primary physical foundation and electrical backbone within the remote I/O architecture. This unit provides a secure, vibration-resistant termination interface between field process devices, sensory instrumentation, and the upper plug-in electronic I/O modules.
Features 18 built-in +V terminals and 18 Common terminals
Enables direct termination for 3-wire proximity and sensor field devices
Internal power rails rated for a maximum continuous current of up to 10 A
The 1794-TB3 features an integrated wiring matrix designed to streamline field connections. It provides 16 distinct I/O signal channels alongside a generous internal power distribution network consisting of 18 common terminals and 18 positive voltage (+V) terminals. This dual-row, high-density 3-wire screw terminal structure allows all conductors from field cables to be wired directly to a single localized base, completely eliminating the necessity for auxiliary terminal blocks, extra cross-connections, or external bridging inside the control enclosure.
The 1794-TB3 supports complete Removal and Insertion Under Power (RIUP) functionality. This allows electronic modules to be replaced safely while the system remains energized, without disturbing the permanent field wiring or disrupting the backplane bus communications. Fully supported within the Rockwell Automation Studio 5000 / RSLogix 5000 hardware profiles, this terminal base serves as a crucial infrastructure component for compact, high-efficiency wiring and power management in modern industrial cabinets.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Allen Bradley 1794-TB3 Terminal Base Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Automotive Manufacturing
Used in stamping shops, robotic welding cells, and powertrain conveyors. It directly connects a large volume of 3-wire inductive proximity switches for workpiece detection, eliminating extra power distribution blocks in the cabinet.
Chemical & Fine Chemical Processing
Used in batch reactor monitoring, sealed batching systems, and hazardous gas leak detection. Partnered with barriers or isolators, it connects field digital I/O. Its hot-swapping capability ensures continuous uptime for chemical production.
Steel Mills & Metallurgical Industry
Applied in blast furnaces, converters, and steel rolling mill cooling fans/pump monitors. It reliably captures solenoid valve statuses, hydraulic station pressures, and heavy-duty motor interlocks under high-temperature and high-EMI environments.
Power Generation & Utilities
Used in power plant Balance of Plant systems, auxiliary machinery controls, and hydro-turbine units. It interfaces with circuit breaker auxiliary contacts, motorized valves, and oil pressure relays.
Pharmaceutical & Biotechnology
Used in large-scale fermenter systems, centrifuge control cabinets, and automated cleanroom HVAC systems. It collects ambient temperature, humidity, and differential pressure data. Its maintenance-free, high-quality termination helps comply with GMP validation mandates.
Pulp & Paper Manufacturing
Applied in paper machine wet/dry sections, paper cutters, and coating machines. It accepts intricate interlock signals, sheet-break detectors, and hydraulic valve feedbacks under humid and corrosive environments.
When using the 1794-TB3, routinely inspect for screw loosening in high-vibration environments. The internal power rail is rated for a maximum of 10 A; do not overload it when daisy-chaining multiple high-power modules. Always insert or remove electronic modules vertically and smoothly during hot-swapping (RIUP) to protect the base pins from damage. Lastly, strictly follow the tiered wiring discipline—Row A (Signal), Row B (Common/-V), and Row C (+V)—to prevent short circuits.
The 1794-TB3 by Allen-Bradley is a screw-clamp, 3-wire terminal base designed for Flex I/O modules. The layout is split into two rows, housing 16 channels on one row and 18 terminals on the other. This unit handles electrical specifications up to a 132 VAC maximum rating and delivers a robust current capacity of 10 A.
Which digital and analog FLEX I/O modules are electrically and mechanically compatible with the 1794-TB3 terminal base?
It is cross-compatible with a wide range of standard and extended-temperature FLEX I/O modules, including 1794-IA16, 1794-IB16, 1794-OB16, 1794-OW8, and their respective XT/P variants.
What mechanism does the 1794-TB3 utilize for wire retention?
It features a robust screw clamp terminal configuration for secure wire clamping.
How many total termination points are available on the 1794-TB3?
The baseboard is equipped with a comprehensive layout of 52 terminals.
Which specific terminal range on the 1794-TB3 base is designated for field sensor and actuator signal landing?
Channel-specific I/O wiring must be terminated exclusively within the 0 to 15 terminal block range.
What is the maximum continuous current rating for the 1794-TB3 power rails?
The internal power bus is engineered to support a maximum current capacity of up to 10 A.
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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