Allen-Bradley 1794-OB8EPXT FLEX I/O Extended Temperature Output Module

Product Overview

The Allen-Bradley 1794-OB8EPXT serves as a ruggedized discrete output module within the FLEX I/O family, specifically engineered for extreme environmental conditions. This module provides 8 independent sourcing outputs at 24V DC, interfacing high-speed industrial controllers with field actuators. The "XT" designation signifies its enhanced thermal resilience, allowing the unit to maintain precise logic control in environments where standard hardware fails. We supply this module in 100% Brand New condition, ensuring peak electronic protection and long-term stability for your distributed I/O architecture.

Technical Specifications

The 1794-OB8EPXT integrates high-density output control with advanced circuit protection:

• Output Type: Discrete 24V DC Sourcing (Current Sourcing)

• Number of Points: 8 Protected Outputs

• Operating Voltage: 24V DC (Nominal)

• Protection Type: Electronic Fusing (Short-circuit and Overload protection)

• Operating Temperature: Extended Range (-20°C to +70°C / -4°F to +158°F)

• Mounting: DIN Rail (via Terminal Base)

• Enclosure Rating: IP20 Open Style

• Weight: 0.20 lbs (0.09 kg)

Engineering Advantages

The 1794-OB8EPXT addresses critical failure points in decentralized automation systems:

• Extreme Thermal Resilience: The XT hardware eliminates the need for specialized cooling or heating equipment in control cabinets. It operates reliably from -20°C to +70°C, making it the standard choice for oil and gas, outdoor infrastructure, and non-climate-controlled factory floors.

• Self-Recovering Electronic Fusing: Each output features electronic fusing. This technology detects overcurrent or short-circuit conditions instantly, shutting down the affected channel to protect the internal circuitry and the rest of the I/O rack without requiring physical fuse replacement.

• Reduced Footprint: The compact FLEX I/O design minimizes rail space. By combining 8 high-current sourcing outputs into a 0.20 lb module, engineers can decrease cabinet sizes and reduce overall system weight.

• Vibration and Shock Resistance: The "XT" manufacturing process involves additional coating and component hardening. This protects the module against the mechanical stresses found in heavy-duty machinery and mobile industrial platforms.

FAQs

• What makes the "XT" version different from the standard 1794-OB8EP?

  The 1794-OB8EPXT utilizes components and manufacturing techniques rated for an extended temperature range (-20°C to +70°C). Standard modules typically only support 0°C to 55°C.

• Does this module require a separate terminal base?

  Yes. The 1794-OB8EPXT mounts onto a 1794 terminal base (such as the 1794-TB3 or 1794-TBN). The base provides the field-side wiring terminations and the connection to the FLEX I/O backplane.

• Is this unit a Brand New original product?

  Yes. We guarantee that this 1794-OB8EPXT is 100% Brand New in its original factory condition. This ensures the electronic fusing and thermal ratings meet the manufacturer's strict safety and performance benchmarks.

• How does the electronic fusing reset?

  The module monitors the load condition. Once you remove the fault (short circuit or overload) and cycle the output or power, the electronic fuse resets automatically, significantly reducing system downtime compared to traditional glass fuses.