Allen-Bradley 1794-OW8XT Flex I/O Relay Output Module

Product Introduction

When industrial applications demand reliable switching for diverse equipment, the Allen-Bradley 1794-OW8XT provides a robust solution. This 8-relay output module belongs to the Rockwell Automation Flex I/O 1794 series, designed to connect various devices through multiple networks while conserving valuable panel space. Its compact form factor and conformal coating enable operation in high-temperature environments without performance degradation.

Technical Specifications

The 1794-OW8XT delivers 8 relay output channels with normally open, isolated contacts. Key electrical parameters include a relay contact rating of 250V AC, initial contact resistance of 30 mΩ, and bounce time of 1.2 ms. The module operates with a Flexbus current of 5V DC and dissipates 5.5W of power, with maximum thermal dissipation of 18.8 BTU/hr. Off-state leakage current is 1.0 mA through the snubber circuit, and minimum contact load is 100 μA at 100 mV DC. Switching frequency reaches 0.3 Hz at rated load, ensuring stable operation for typical industrial cycles.

Industry Applications

In manufacturing lines, the 1794-OW8XT controls solenoid valves, motor starters, and indicator lights with its 8 isolated relay outputs. Its conformal coating makes it ideal for environments with high temperatures or humidity, such as foundries or food processing plants. The module's ability to operate continuously at 0.3 Hz switching frequency suits applications requiring periodic on/off cycles, like conveyor systems or batch processing stations.

Installation & Setup Guidance

Mount the 1794-OW8XT on a DIN rail using a zinc-plated yellow-chromate steel rail for proper grounding. The module requires an external power supply of 24V DC (125 mA). Connect output channels to loads using appropriate terminal base units (available in 9 variants from Allen-Bradley). Always add fusing to output channels for protection against overcurrent. A qualified technician should perform installation and startup due to the advanced equipment involved.

Maintenance & Reliability

Regular inspection of relay contacts and snubber circuits ensures long-term reliability. The conformal coating protects against moisture and contaminants, reducing maintenance frequency. Check thermal dissipation (18.8 BTU/hr max) to ensure adequate ventilation. With proper fusing and routine checks, the module delivers extended service life in demanding industrial settings.

Buying Guide

Before purchasing the 1794-OW8XT, verify compatibility with your control system and terminal base units. Confirm the 24V DC power supply meets the 125 mA requirement. BluePLC Industrial offers this module with expert support to help select the right accessories. Contact us for current availability and lifecycle status.