A-B 1734-AENTR POINT I O Ethernet Adapter

Allen-Bradley 1734-AENTR POINT I/O EtherNet/IP Adapter

 

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The Allen-Bradley 1734-AENTR is a POINT I/O EtherNet/IP network adapter used in Rockwell’s distributed I/O system (POINT I/O 1734 series). It acts as the communication gateway between a PLC (ControlLogix / CompactLogix) and remote I/O modules.

It is not a PLC and not an I/O module itself, but the network interface for the entire POINT I/O rack.

Key Specifications

• Model: 1734-AENTR
• Brand: Allen-Bradley (Rockwell Automation)
• Series: POINT I/O (1734)
• Product Type: EtherNet/IP Redundant / Dual-Port Adapter
• Communication Protocol: EtherNet/IP
• Ethernet Ports:
  • 2 × RJ45 ports
• Network Features:
  • Supports DLR (Device Level Ring)
  • Daisy-chain / line topology
  • Star topology via switches
• I/O Capacity:
  • Up to 63 POINT I/O modules per adapter
• Power Supply:
  • 24V DC
• Mounting:
  • DIN rail
• Diagnostics:
  • LED status indicators (network / module / POINTBus)

What it does (simple explanation)

This module works like the “network brain” of a remote I/O station:

PLC (ControlLogix / CompactLogix)
↓ Ethernet/IP
1734-AENTR Adapter
↓ POINTBus
Digital / analog I/O modules (1734-IB, OB, IE, etc.)

So it:

• Connects remote I/O racks to PLC
• Transmits real-time I/O data
• Sends diagnostics back to PLC
• Enables distributed control architecture

Key Features

• Dual Ethernet ports (supports redundancy / DLR ring)
• High-capacity POINT I/O system (up to 63 modules)
• Supports hot swapping of I/O modules (RIUP)
• Fast industrial Ethernet communication (EtherNet/IP)
• Built-in diagnostics for network and module health
• Flexible topology: line, star, or ring

System Role

Typical architecture:

Sensors / Actuators
↓
POINT I/O Modules
↓
1734-AENTR Adapter
↓
PLC (ControlLogix / CompactLogix)
↓
SCADA / HMI system

So it is:

• ❌ Not a PLC (no logic execution)
• ❌ Not an I/O module (no direct field wiring for control logic)
• ✔ A remote I/O communication adapter

Applications

• Factory automation systems
• Packaging production lines
• Automotive assembly lines
• Machine distributed I/O cabinets
• Process control systems
• Conveyor systems and material handlin