Allen-Bradley 1769-ARM CompactLogix Address Reserve Module

Functional Overview

The 1769-ARM serves as a specialized placeholder within a CompactLogix I/O assembly. Its primary purpose is to reserve a specific slot address for future hardware integration without disrupting the current I/O configuration or PLC memory mapping. By utilizing the 1769-ARM, engineers can develop and commission control software for planned expansions, ensuring that the existing hardware addresses remain consistent when the permanent I/O module is eventually installed.

Technical Specifications

• Manufacturer: Allen-Bradley / Rockwell Automation

• Product Line: CompactLogix

• Module Type: Address Reserve Placeholder

• Part Number: 1769-ARM

• Series: Revision A and B compatible

• Backplane Current Draw: 60 mA at 5.1V DC (Note: 1.4A at 24V is the bus limit, the module itself draws minimal power)

• Power Consumption: 0.31 Watts typical

• Power Dissipation: 0.31 Watts

• Isolation Voltage: 30V (continuous), Basic Insulation Type

• Enclosure Type: Open-style (IP20)

• Operating Temperature: 0°C to 60°C (32°F to 140°F)

• Storage Temperature: -40°C to 85°C (-40°F to 185°F)

• Vibration: 5 G at 10 to 500 Hz

• Shock: 30 G operational

• Weight: 0.11 kg (0.25 lbs)

Operational Implementation

The 1769-ARM is essential for modular machine design where different versions of a system may require varying I/O counts. It maintains the continuity of the 1769 bus, allowing data to pass through to subsequent modules. Unlike standard I/O modules, the 1769-ARM does not perform data conversion; it simply holds the logical "spot" in the RSLogix 5000 or Studio 5000 project.

Frequently Asked Questions

Does the 1769-ARM require configuration in Studio 5000?Yes, the module must be added to the I/O configuration tree as a "1769-ARM" to ensure the controller recognizes the slot as reserved and does not trigger a major fault for a missing module.

Can I hot-swap this module for a functional I/O module?While CompactLogix supports various maintenance features, it is recommended to power down the system when replacing the 1769-ARM with a permanent I/O module to ensure the backplane correctly initializes the new hardware.