A-B 1734-IB4 Digital Input Module

A-B 1734-IB4 Digital Input Module

The Allen-Bradley 1734-IB4 is a POINT I/O 4-point digital input module used in Rockwell Automation distributed I/O systems.

Product Information

• Brand: Allen-Bradley (Rockwell Automation)
• Series: POINT I/O 1734
• Part Number: 1734-IB4
• Type: Digital Input Module
• Inputs: 4 channels
• Input Type: 24V DC sinking input (digital ON/OFF signals)

Electrical Specifications

• Input Voltage Range: 10–28.8 V DC
• Nominal Input Voltage: 24 V DC
• Input Current: approx. 4–5 mA per channel
• Isolation Voltage: 50 V continuous (internal isolation)
• Backplane Current: max 75 mA @ 5 V DC
• Mounting: 1734 terminal base (1734-TB / 1734-TBS)

Function (Simple Explanation)

This module is used to collect digital signals from field devices and send them to the PLC system, such as:

• Proximity sensors
• Limit switches
• Push buttons
• Relay contacts
• Safety or status signals

It only reads ON/OFF signals, not analog values.

System Role

PLC CPU (CompactLogix / ControlLogix)
→ POINT I/O adapter
→ 1734-IB4 input module
→ Field devices (sensors, switches)

It is a signal acquisition module, not a controller or power device.

Application Areas

• Factory automation systems
• Conveyor systems
• Packaging machines
• Small distributed control systems
• Machine status monitoring

Key Features

• Compact POINT I/O design
• 4-channel high-density digital input
• LED status indicators per channel
• Easy expansion in distributed I/O racks
• Reliable 24V industrial signal detection

Precautions

• Must be installed with correct 1734 terminal base
• Only supports 24V DC digital signals
• Do not connect AC signals directly
• Ensure correct sinking wiring configuration
• Proper grounding required for stable operation