A-B 1734-IB4 Digital Input Module

Allen-Bradley 1734-IB4 Digital Input Module (POINT I/O)

 

 

The Allen-Bradley 1734-IB4 is a POINT I/O 24V DC digital input module used in Rockwell Automation distributed control systems. It is designed to read ON/OFF field signals from devices such as sensors, pushbuttons, and limit switches.

It is not a controller or communication module—it is a 4-channel input interface module in the POINT I/O system.

Key Specifications

• Model: 1734-IB4
• Brand: Allen-Bradley (Rockwell Automation)
• Series: POINT I/O (1734)
• Product Type: Digital Input Module
• Input Channels: 4 points
• Input Type:
  • 24V DC sinking inputs
• Input Voltage Range:
  • ~10 to 28.8V DC (24V nominal)
• Field Power:
  • 24V DC external supply
• Mounting:
  • DIN rail via POINT I/O terminal base (1734-TB / 1734-TBS)
• System Integration:
  • Works with adapters like 1734-AENTR (EtherNet/IP)

What it does (simple explanation)

This module acts like a signal reader:

Field devices (sensors / switches)
↓
1734-IB4 input module
↓
PLC via POINT I/O adapter
↓
Control logic response

So it:

• Detects ON/OFF signals
• Sends status to PLC
• Provides feedback from machines and sensors

Key Features

• 4-channel 24V DC digital input
• LED status indicators per channel
• Compact modular design (POINT I/O system)
• Electrical isolation between field and logic side
• Stable operation in industrial environments
• Easy integration with ControlLogix / CompactLogix systems

System Role

Typical architecture:

Sensors → 1734-IB4 Input Module → 1734-AENTR Adapter → PLC → Control system

So it is:

• ❌ Not a PLC CPU
• ❌ Not a communication module
• ✔ A digital input acquisition module

Applications

• Machine status monitoring
• Limit switch feedback
• Proximity sensor inputs
• Conveyor and automation systems
• Industrial safety signal monitoring
• Factory production lines