A-B 1762-OW16 MicroLogix Relay Output Module

Allen-Bradley 1762-OW16 MicroLogix Relay Output Module

 

 

The Allen-Bradley 1762-OW16 is a MicroLogix expansion relay output module used in MicroLogix 1100 / 1200 / 1400 PLC systems. It provides 16 electromechanical relay outputs that allow the PLC to switch both AC and DC field loads such as contactors, solenoids, lamps, and alarms.

Product Information

• Brand: Allen-Bradley (Rockwell Automation)
• Model: 1762-OW16
• Series: MicroLogix 1200/1400 expansion I/O
• Type: Relay Output Module
• Outputs: 16 channels (2 groups of 8)
• Output type: Dry contact relay (NO contact)
• Voltage range: 5–265V AC / 5–125V DC
• Mounting: DIN rail expansion module (side-mounted)

What it actually does

This module is used to:

• Turn ON/OFF external electrical loads
• Drive devices such as:
  • Motor starters (via contactors)
  • Solenoid valves
  • Alarm lights / buzzers
  • Relays and interposing circuits

Each output works like a “mini mechanical switch controlled by PLC logic.”

System Role (Simple)

PLC CPU (MicroLogix 1200/1400)
→ internal bus
→ 1762-OW16 relay output module (this unit)
→ field devices (AC/DC loads)

So it acts as a “high-voltage switching interface between PLC logic and real-world equipment.”

Key Features

• 16 relay outputs (NO contacts)
• AC and DC load compatibility
• Two isolated groups (8 + 8 channels)
• LED status indicators per channel
• High flexibility for industrial loads
• Simple screw terminal wiring
• Rugged industrial design for continuous operation

Electrical Characteristics (important for listings)

• Max current per point: ~2.5 A
• Max current per module: ~16 A
• Contact type: Electromechanical relay
• Switching delay: ~10 ms
• Isolation: Group isolated outputs
• Load type: Resistive / inductive (with proper suppression)

Typical Applications

• Machine automation systems
• Packaging equipment
• Conveyor systems
• Pump control systems
• Industrial lighting control
• HVAC control panels
• Motor starter control (via relays/contactors)

Advantages

• Can directly switch AC and DC loads
• No leakage current (unlike SSR outputs)
• Strong compatibility with inductive loads (with protection)
• Easy troubleshooting (relay click + LED indication)
• Widely used MicroLogix ecosystem module

Important Notes

• Not PLC CPU ❌
• Not analog module ❌
• Not communication module ❌
• It is a digital relay output expansion module ✔

Precautions

• Relay contacts are mechanical → limited life cycle
• Inductive loads require snubber / flyback protection
• Do not exceed current rating per channel/module
• Wiring must be separated into group commons correctly
• Not suitable for high-speed switching applications