A-B 1769-CRR1 Expansion Cable Module

Allen-Bradley 1769-CRR1 Expansion Cable Module (Compact I/O Bus Cable)

 

The Allen-Bradley 1769-CRR1 is a Compact I/O expansion bus cable used in CompactLogix and MicroLogix 1500 systems. It is designed to connect two 1769 I/O banks (right-to-right connection) so the PLC system can be expanded with additional I/O modules.

It is not a communication module, but a backplane expansion cable for extending the physical I/O structure.

Key Specifications

• Model: 1769-CRR1
• Brand: Allen-Bradley (Rockwell Automation)
• Series: Compact I/O 1769
• Product Type: Right-to-Right Expansion Cable
• Cable Length:
  • 305 mm (1 ft)
• Connection Type:
  • Right bank to right bank
• System Use:
  • Expands Compact I/O backplane between module groups
• Included:
  • Cable + termination caps
• Operating Temperature:
  • 0–60°C

(verified from industrial catalog data)

What it does (simple explanation)

CompactLogix System Structure:

PLC CPU
↓
1769 I/O Bank 1
↓
1769-CRR1 Expansion Cable
↓
1769 I/O Bank 2
↓
More I/O modules

It allows the system to:

• Physically split I/O into multiple banks
• Expand number of modules beyond one rack limit
• Maintain high-speed backplane communication

Main Functions

• Expands 1769 Compact I/O system
• Connects two I/O module banks
• Transfers backplane data between banks
• Enables system scalability
• Supports distributed cabinet layouts

Key Features

• Compact 1 ft (305 mm) industrial cable
• High-speed backplane communication
• Includes termination caps for stable signal integrity
• Designed for modular PLC expansion
• Reliable industrial-grade shielding
• Plug-and-play installation between I/O banks

Applications

• Large CompactLogix automation systems
• Multi-section control cabinets
• Factory production lines
• Conveyor and material handling systems
• OEM machine control systems