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Allen-Bradley 1790-T8BV8BX Expansion Unit

1. Product Description

The 1790-T8BV8BX is a digital I/O expansion module from Allen-Bradley’s CompactBlock LDX I/O series, designed for light industrial automation applications. It extends the capabilities of 1790D CompactBlock LDX I/O systems by adding 8 digital input/output points, supporting 24V DC, 120V AC, or relay outputs for flexible control configurations .

2. Key Features

Compact & Modular Design – Space-saving form factor for installation in tight spaces, such as control panels or operator terminals .
Flexible I/O Expansion – Adds 8 digital I/O points to a 1790D base unit, allowing up to 80 I/O points per node when combined with other expansion modules .
Multiple Output Types – Supports 24V DC (sinking/sourcing), 120V AC, or relay outputs, making it adaptable to various automation needs .
Easy Installation – Uses 7 cm ribbon cable connectors for quick integration with 1790D base units .
DeviceNet Compatibility – Works seamlessly with DeviceNet networks, simplifying distributed I/O deployment .
Tool-less Wiring Options – Available with screw terminals or detachable D-sub connectors for simplified maintenance .

3. Technical Specifications

Parameter	Specification
I/O Points	8 digital (configurable as inputs or outputs)
Voltage Options	24V DC / 120V AC / Relay
Max Current per Point	2A (relay), 0.5A (solid-state)
Communication	DeviceNet (via base unit)
Mounting	DIN rail (35 mm)
Operating Temperature	0°C to 60°C (32°F to 140°F)
Protection Rating	IP20 (open-style enclosure)
Compatibility	1790D CompactBlock LDX base units

4. Applications

Material Handling – Conveyor control, sensor interfacing .
Packaging Machinery – Actuator and solenoid control .
Light Industrial Automation – Small-scale distributed I/O for cost-effective solutions .

5. Installation & Precautions

Base Unit Required – Must be connected to a 1790D CompactBlock LDX base unit (e.g., 1790D-8BV8B) .
Wiring Compliance – Use shielded cables in high-noise environments .
Load Matching – Ensure per-point current does not exceed ratings (0.5A for solid-state, 2A for relays) .
Environmental Limits – Avoid condensation or excessive dust (IP20 rating) .