The 1794-OA16 Flex I/O module by Allen-Bradley controls sixteen AC output channels. This unit operates without channel isolation for simplicity. It switches loads within a 74-132 VAC range at 47-63 Hz. Engineers use it to energize relays, solenoids, and contactors. Its robust design handles pilot duty loads with a 5 Amp inrush. Procurement teams select this module for its proven reliability in industrial settings.
Product Procurement & Buyer Guide
This section offers a critical guide for engineers and buyers. It focuses on the exact specifications of the 1794-OA16 module.
Understanding Non-Isolated Output Architecture
The 1794-OA16 features sixteen non-isolated output channels.
This design simplifies wiring but requires careful common voltage management.
You must connect a single AC common source for all channels.
This module lacks individual channel isolation from the backplane.
Verify your system’s common voltage matches the 120 VAC nominal rating.
Mismanagement here can cause unexpected load behavior or ground loops.
Always consult the system grounding guide before installation.
Critical Electrical Specifications for Selection
Each output channel handles a maximum of 500 mA at 55°C.
The total module output current rating is 4.0 Amps maximum.
The module requires a minimal on-state current of 5 mA per point.
Its on-state voltage drop stays low at 1.5 Volts AC at 0.5 Amps.
The off-state leakage current is a maximum of 2.25 mA.
This module draws only 80 mA from the 5 Volt DC FlexBus.
These specs ensure efficient operation within your control cabinet.
Thermal and Environmental Constraints
The 1794-OA16 dissipates a maximum of 4.7 Watts at 0.5 Amps.
Its thermal dissipation reaches 16.1 BTU per hour under full load.
The module operates reliably from 0°C to 55°C (32°F to 131°F).
It withstands storage temperatures from -40°C up to 85°C.
The unit resists 5G vibration from 10 to 500 Hertz.
It survives operating shocks of 30 G and non-operating shocks of 50 G.
This device also handles 8 KV of ESD air discharge.
These tolerances make it suitable for harsh factory floor environments.
Compatible Terminal Base Selection
This module requires a dedicated terminal base for wiring.
Compatible bases include the 1794-TBN, 1794-TBNF, and 1794-TB3.
The 1794-TB3 offers three strips of screw clamp terminals.
It supports daisy-chaining power to adjacent modules.
For fused output protection, select the 1794-TBNF base.
The standard 1794-TBN base requires external auxiliary terminal blocks.
This choice impacts installation complexity and system safety.
Fusing and Protection Protocols
The 1794-OA16 does not include internal output fuses.
It relies on the terminal base or external fusing for protection.
Selecting the 1794-TBNF terminal base provides a fuse for each channel.
The module contains a built-in 2.5 Amp, 150V AC normal blow fuse.
This internal fuse protects the module’s internal circuitry only.
Always coordinate with your project’s safety requirements.
This ensures protection for both the module and field wiring.
