Allen-Bradley 1794-OA8 Flex I/O Digital Output Module 120V AC 8 Outputs

Product Overview

The Allen-Bradley 1794-OA8 is a FLEX I/O digital output module. It provides 8 non-isolated AC outputs. This module operates at 120 Volts AC. It is part of the Rockwell Automation product line. The 1794-OA8 module helps diagnose field device issues. It also reduces start-up time. This module is suitable for non-hazardous environments. It can also be used in Class 1, Division 2 locations. The module has a nominal output voltage of 120V AC. Each output can handle up to 500 mA at 55°C. The current rating varies with temperature.

Application Scenarios

The 1794-OA8 module is ideal for controlling AC loads. Common applications include motors, solenoids, and relays. It is used in factory automation and process control. The module works well in distributed I/O systems. It connects to various terminal base units. These include the 1794-TBNK, 1794-TBKD, and 1794-TB3K. The module reduces troubleshooting time. It monitors field wiring and power supply conditions. This makes it perfect for high-uptime installations.

Technical Specifications

• Outputs: 8 non-isolated
• Output Voltage: 120V AC nominal (85-132V AC)
• Output Current Rating: 4.0A total, 500 mA per output at 55°C
• On-state Voltage Drop: max 1.0V @ 0.5A
• Off-state Leakage Current: max 2.25 mA
• FlexBus Current: 80 mA @ 5V DC
• Power Dissipation: 4.1W @ 0.5A
• Thermal Dissipation: 14.0 BTU/hr @ 0.5A
• Isolation Voltage: 120V Continuous
• Surge Current: 7A for 40 ms, repeatable every 8 seconds
• Output Signal Delay: max 1/2 cycle for ON-OFF and OFF-ON
• Dimensions: Standard Flex I/O module size

Installation & Maintenance Guide

Install the 1794-OA8 module onto a compatible terminal base unit. Compatible bases include 1794-TBNK, 1794-TBKD, 1794-TB3K, and others. Ensure the module is properly aligned with the FlexBus connector. Slide the module into place and secure it. Use auxiliary terminal strips if using the 1794-TBN base. The module requires no field wiring adjustments. For maintenance, keep the module clean and dry. Check connections periodically. The module has diagnostic features to indicate faults. Replace the module if it fails to operate correctly.

Packing List

The package includes:

• 1 x Allen-Bradley 1794-OA8 Output Module
• 1 x Installation and User Guide