Allen-Bradley 1794-OA16 Flex IO AC Digital Output Module Overview

Why Choose the 1794-OA16 for Your AC Load Control?

When your industrial system demands reliable switching of AC loads like contactors, pilot lamps, or solenoid valves, the Allen-Bradley 1794-OA16 delivers a proven solution. This Flex IO AC digital output module handles up to 16 non-isolated channels, simplifying wiring while maintaining performance. But what makes it stand out in demanding environments? Let us explore its design and capabilities.

Product Introduction

The Allen-Bradley 1794-OA16 is a Flex IO AC digital output module from Rockwell Automation. It features sixteen (16) non-isolated output channels with an output voltage range of 74-132VAC, operating at 47-63 Hz. This module is compatible with a variety of terminal bases, including 1794-TBN, 1794-TBNF, 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBKD, 1794-TBNK, 1794-TBNFK, 1794-TB3K, and 1794-TB3SK. It works with any 1794 Flex IO adapter to integrate into your control network. The module mounts on a DIN rail and includes 16 yellow status indicators for quick diagnostics.

Technical Specifications Breakdown

Understanding the key specs of the 1794-OA16 helps you apply it correctly. The module provides 16 non-isolated outputs, meaning all channels share a common reference. The ON-state voltage ranges from a minimum of 74VAC to a nominal 132VAC, covering standard 120VAC applications. Each output supports a minimum on-state current of 5 mA and a maximum of 500 mA at 55°C, with a total module current rating of 4.0 A. The off-state leakage current is limited to 2.25 mA maximum, ensuring reliable load de-energization. The module draws 80 mA from the FlexBus at 5V DC and dissipates up to 4.7 W at 0.5 A. Its operating temperature range is 0 to 55°C (32 to 131°F), and it can withstand 5g vibration at 10 to 500 Hz.

Industry Applications

The 1794-OA16 excels in controlling AC loads in manufacturing, material handling, and process industries. Use it to energize relay coils, contactors, solenoid valves, pilot lamps, and audible alarms like horns or sirens. For example, in a packaging line, this module can switch multiple AC-powered actuators simultaneously, reducing wiring complexity. Its 16-channel density allows compact control cabinets, saving space and cost. The non-isolated design works well when loads share a common AC neutral, simplifying installation.

Installation & Setup Guidance

Mount the 1794-OA16 on a DIN rail using any compatible terminal base from the list above. Wire size depends on the terminal base selected; refer to its documentation for proper gauge. The keyswitch position is 8, ensuring correct module insertion. Connect the external AC power supply at 120VAC to the terminal base. For the 1794-TBN base, auxiliary terminal blocks are required to connect the 120VAC common voltage for individual channels. Always verify that the output voltage matches your load requirements (74-132VAC range). The module is an open-type enclosure, so install it in a suitable cabinet to protect against dust and contaminants.

Maintenance & Reliability

Routine inspection of the 1794-OA16 ensures long service life. Check the yellow status indicators periodically to verify output operation. The module includes an internal 2.5 A, 150VAC normal blow MQ2 fuse for overcurrent protection. If outputs fail, test the fuse first. Keep the ambient temperature within 0 to 55°C and avoid condensation by maintaining 5-95% non-condensing relative humidity. The module withstands 30g operating shock and 50g non-operating shock, making it robust for industrial environments. For safety-rated systems, follow the manufacturer's safety manual for periodic testing.

Compatibility & Integration

The 1794-OA16 integrates seamlessly with any 1794 Flex IO communication adapter, such as ControlNet, DeviceNet, or EtherNet/IP versions. This flexibility allows connection to Rockwell Automation controllers like ControlLogix or CompactLogix. The module uses the FlexBus backplane for power and data, simplifying wiring. Its 16-channel density reduces the number of modules needed, lowering overall system cost. Always verify adapter compatibility with your specific controller before ordering.

Buying Guide & Purchasing Advice

Before purchasing the 1794-OA16, confirm your terminal base requirements. The module works with multiple bases, but the 1794-TBNF includes fusing for individual outputs, while the 1794-TBN requires auxiliary terminal blocks for common connections. Check your system voltage: the module operates at 74-132VAC, ideal for 120VAC applications. For complete technical specifications, contact BluePLC Industrial. Our team can help you select the right terminal base and adapter for your application. We stock genuine Allen-Bradley products and offer fast shipping to minimize downtime.

Please verify current lifecycle status and availability with BluePLC Industrial before ordering.