ALLEN BRADLEY 1769-ARM CompactLogix Address Reserve Module

The ALLEN BRADLEY 1769-ARM, also cataloged as the 1769-ARM Address Reserve Module, operates as a dedicated hardware component for slot address reservation within CompactLogix and MicroLogix 1500 I/O platforms. Installed directly into a 1769 Compact I/O bank, the module maintains backplane addressing structure when a functional I/O card is removed. By occupying the physical slot location without processing field signals, the unit preserves system logic mapping and eliminates the requirement for controller memory reprogramming or address re-mapping during maintenance.

Hardware Specifications

Deterministic Network Performance & Backplane Velocity

The 1769-ARM integrates directly into the CompactLogix backplane bus structure, preserving signal path continuity across adjacent modules without altering deterministic network timing. The unit maintains stable backplane bus communication velocity across EtherNet/IP and ControlNet topologies by presenting standard bus termination impedance without introducing signal processing delays. High firmware flash compatibility across Series A and Series B CompactLogix controllers ensures seamless recognition without driver updates or logic modifications.

Frequently Asked Questions

Q: Does the 1769-ARM draw power from the 24 VDC backplane bus?

A: No, the 1769-ARM draws 0 mA from the 24 VDC bus and consumes only 50 mA from the 5.1 VDC backplane supply to power its basic identification circuit.

Q: Can the 1769-ARM be installed while the CompactLogix controller is executing logic?

A: No, 1769 backplane assemblies do not support hot-swapping under power; system power must be disconnected before inserting or removing the reserve module.

Field Installation Guidelines

Mount the 1769-ARM securely onto an IEC standard DIN rail or panel surface using the integrated mounting feet. Lock the adjacent bus lever locks completely to engage the internal backplane pin headers and establish continuity across the 1769 I/O bank.

Because the module contains no terminal blocks or field-side wiring connections, verify that all empty wire raceways around the slot are secured. Keep field signal conductors and high-voltage AC lines away from the module faceplate to avoid induce noise into adjacent active I/O cards, and ensure panel enclosure grounding meets local industrial electrical standards.