A-B 1734-OW4 Relay Output Module

A-B 1734-OW4 Relay Output Module

The Allen-Bradley 1734-OW4 is a POINT I/O 4-channel relay output module used in distributed I/O systems for switching AC/DC loads.

Product Information

• Brand: Allen-Bradley (Rockwell Automation)
• Series: POINT I/O 1734
• Part Number: 1734-OW4
• Type: Relay Output Module
• Outputs: 4 channels
• Contact Type: Normally Open (SPST, Form A electromechanical relay)

Electrical Specifications

• Output Type: Relay dry contact output
• Rated Load:
  • 5–30 V DC
  • 120–240 V AC (up to 2 A per channel)
• Isolation: Channel-to-channel isolated relay outputs
• Backplane Power: 5 V DC via POINT I/O system
• Power Dissipation: approx. 0.5 W
• Switching Frequency: low (mechanical relay, limited life cycle)

Function (Simple Explanation)

This module is used to turn ON/OFF external electrical devices from a PLC system, such as:

• Solenoid valves
• Contactors
• Alarm lights
• Small motors (via relay/contactor interface)

It works like an electrically controlled switch.

System Role

PLC CPU (CompactLogix / ControlLogix)
→ POINT I/O adapter
→ 1734-OW4 relay output module
→ Field devices (AC/DC loads)

It provides physical dry contact switching, not analog control.

Application Areas

• Industrial automation systems
• Machine control panels
• Conveyor systems
• Pump and motor control
• Lighting and alarm systems
• Distributed I/O control cabinets

Key Advantages

• Supports both AC and DC load switching
• True relay isolation (no solid-state leakage issues)
• Flexible output use for mixed voltage systems
• Easy integration into POINT I/O architecture
• Reliable for general-purpose switching

Precautions

• Mechanical relay wear limits lifetime
• Do not exceed rated current (typically 2A per channel)
• Inductive loads require suppression (diodes or snubbers)
• Switching speed is slow compared to transistor outputs
• Requires proper terminal base (1734-TB / TB series)