Overview
The Allen-Bradley 1794-TB32S /A terminal base is a field-wiring interface for the Flex I/O 1794 series. This FLEX I/O terminal base has 32 I/O terminals, eight common terminals, and 8 +voltage terminals. Each Flex I/O series input and output module requires a terminal base unit like the 1794-TB32S, which supports snapping onto a DIN rail on the I/O adapter module’s right side to form a complete Flex I/O control system.
Key Features
- 32 I/O point terminal base unit with 8 common terminals and 8 voltage terminals
- Spring clamp termination; open style and DIN mount
- Features spring clamp, 3-wire connection support, and screw termination
- Comes with terminal connection points for the wiring of the I/O module it hosts and can connect to other terminal bases to make a backplane
- UL Listed Industrial Control Equipment, certified for US and Canada (UL File E65584)
Technical Specifications
- Terminal screw torque: 0.56-0.79 Nm
- Supply voltage: 31.2V DC/AC, 50/60Hz, 10A maximum
- Maximum isolation voltage: 50 Volts (continuous) with basic insulation between field wiring terminals and Flexbus
- Flexbus current rating: 640 milliamps at 5 Volts DC; I/O terminals current rating: 2 Amps maximum
- Wire size: 0.34-3.3mm² (22-12 AWG); dimensions: 94x94x69 mm
- Operating temperature: -20 to 70°C; non-operating temperature: -40 to 85°C; humidity: 5 to 95% non-condensing
Typical Applications
The 1794-TB32S /A is deployed in industrial automation systems requiring modular I/O connectivity:
- Compact machinery control and process automation
- OEM panel-mount and DIN-rail enclosure systems
- Field I/O distribution in PLC-based motion control
- In-cabinet automation requiring flexible terminal-block interfaces
Compatibility & Replacements
The 1794-TB32S terminal base is part of the Flex I/O 1794 product line from Rockwell Automation (Allen-Bradley). It mates with any 1794 series input or output module and is compatible with CompactLogix, ControlLogix, and other systems supporting Flex I/O architecture. The “/A” suffix denotes a standard commercial variant. Related models in the terminal base family include the 1794-TB3 (3-point), 1794-TB3S, and other variants; consult your system documentation or contact your distributor to verify module compatibility. Terminal bases are not generally field-substitutable across product families—always confirm compatibility before ordering replacements.
