Product Overview

The Allen-Bradley 1794-OC16 belongs to the Flex I/O 1794 series. This module delivers sixteen non-isolated sourcing digital outputs. Each channel operates with a nominal 48V DC output voltage. The 1794-OC16 mounts onto a Flex I/O terminal base for distributed control systems. Panel manufacturers prefer this module because it eliminates separate terminal blocks between logic and field devices.

Technical Specifications

The 1794-OC16 has a minimum output voltage of 30V DC. Its maximum output voltage reaches 60V DC at 45 °C. The maximum off-state voltage is also 60V DC. Off-state leakage current stays below 1.0 mA maximum.

Current ratings for the 1794-OC16:

• Minimum on-state current: 2.0 mA per channel

• Maximum on-state current: 500 mA per channel

• Total module output current: 8 Amps (16 x 0.5A)

• Maximum on-state voltage drop: 1.0V DC at 0.5A

Power and thermal data:

• FlexBus current: 80 mA at 5V DC

• Power dissipation: 3.7W at 60V DC

• Tested isolation: 1900V DC for 1 second (system to user side)

Physical dimensions:

• Width: 3.7 inches (94 mm)

• Height: 3.7 inches (94 mm)

• Depth: 2.7 inches (69 mm)

• The 1794-OC16 weighs approximately 0.11 kg

LED Indicators

The 1794-OC16 features 16 yellow LED indicators. Each output channel has one dedicated LED. The LED illuminates when the output is energized. It turns OFF when the output is de-energized. These indicators help operators verify output status at a glance. Troubleshooting field devices becomes faster with visual confirmation.

Compatible Terminal Bases

The 1794-OC16 requires a Flex I/O terminal base for installation. The terminal base provides field wiring connections and DIN rail mounting. Compatible terminal bases for this module are:

• 1794-TB3 terminal base

• 1794-TB3S terminal base (screw type)

• 1794-TB3K terminal base (spring clamp)

• 1794-TB3SK terminal base (spring clamp with shielding)

The 1794-OC16 uses keyswitch position 2. Always set the keyswitch to the correct position before installation. This mechanical keying prevents incorrect module insertion.

Output Characteristics

The 1794-OC16 uses sourcing output architecture. Each channel supplies positive DC voltage to the connected load. Typical loads include solenoids, indicator lamps, relay coils, and small actuators. The outputs are non-isolated from each other. All sixteen channels share a common reference point. The module withstands 1900V DC for one second between system and user side. This test verifies safety isolation from control logic.

Installation Guidelines

Install the 1794-OC16 onto a compatible terminal base first. Mount the terminal base onto a standard DIN rail. Push the module firmly until the backplane connector fully seats. Secure the module using the terminal base locking tab. Wire field loads according to the terminal base manual. The module supports horizontal or vertical mounting orientation.

Do not exceed 500 mA per channel continuous current. Keep total module current below 8 Amps. Provide external fusing for each output channel if required. The 1794-OC16 has no internal overcurrent protection. Allow proper ventilation around the module for heat dissipation.

Hot Insertion Feature

The Flex I/O system supports module removal and insertion under power. You can swap the 1794-OC16 without disconnecting field wiring. This feature reduces system downtime during maintenance. Always verify the replacement module has the same keyswitch position. Insert the module straight into the terminal base until it locks.

Package Contents

• One Allen-Bradley 1794-OC16 Flex I/O Digital Output Module

• One keyswitch label (position 2)

• Product identification label

Frequently Asked Questions (FAQ)

1. What is the maximum output current per channel on the 1794-OC16?
The 1794-OC16 provides 500 mA maximum on-state current per channel. Total module current cannot exceed 8 Amps.

2. What voltage range does the 1794-OC16 support?
The 1794-OC16 supports 30 to 60V DC output voltage. Nominal operating voltage is 48V DC.

3. Are the outputs on the 1794-OC16 isolated from each other?
No, the 1794-OC16 outputs are non-isolated. All sixteen channels share a common reference point.

4. What terminal bases work with the 1794-OC16?
The 1794-OC16 works with 1794-TB3, 1794-TB3S, 1794-TB3K, and 1794-TB3SK terminal bases. Keyswitch position must be set to 2.

5. Can I remove the 1794-OC16 while power is applied?
Yes, the 1794-OC16 supports hot insertion. You can remove or replace it without powering down the system.