Allen-Bradley 1769-ARM CompactLogix Address Reserve Module

Product Overview

The Allen-Bradley 1769-ARM functions as an Address Reserve Module within the CompactLogix and MicroLogix 1500 controller platforms. This specialized hardware card reserves a specific physical slot location and logical I/O memory address within the control project configuration before the user installs the actual physical I/O hardware. We supply this backplane mapping component exclusively in 100% brand new, original factorycondition to preserve complete bus loop continuity, maintain structural circuit path scaling, and ensure immediate mechanical compatibility with existing 1769 chassis rails.

Technical Specifications

Engineering Advantages

• Eliminates PLC Code Re-Writing Disruption: This module acts as a logical placeholder in the I/O configuration. When engineers expand the factory automation system later, they replace the 1769-ARM with an actual input/output card of the same footprint. This prevents the master CPU from faulting and eliminates the need to alter data registers, reassign memory aliases, or rewrite application program code.

• Maintains Precise Backplane Impedance Matching: The module draws 1.4 Amps at 24 Volts across the 1769 bus, mimicking a live electronic load. This continuous current loop stabilizes backplane power dynamics and prevents signal reflections or communication jitter from corrupting data on adjacent analog and digital modules.

• Protects Open Backplane Contacts from Corrosive Dust: Installing this un-wired dummy module seals the open backplane connectors of the chassis expansion slot. This barrier prevents airborne conductive particulates, oil mist, and humidity from settling onto raw copper connector pins, stopping short circuits in harsh environments.

• Saves Engineering Design Layout Changes: The ultra-lightweight 0.25 lbs frame locks directly onto standard DIN rails using built-in interlocking tongue-and-groove side sliders. This physical lock allows control system builders to establish exact wire-run pathways and allocate structural panel space during initial build phases.

FAQs

• Does this module require any physical wire terminations or field wiring arms?

  No. The 1769-ARM features an un-wired, blank faceplate. It connects strictly through the internal backplane bus interface pins to reserve hardware addresses, eliminating any need for external terminal blocks or signal wiring.

• Is this item a cleaned surplus card or an authentic factory-new piece?

  We guarantee this product is 100% brand new, authentic factory-original stock. It ships directly inside its original manufacturer box with protective anti-static wrap, factory quality control stamps, and unblemished backplane pins completely intact.

• Can this module swap into a live system, or must I cut the panel power completely?

  Turn off the 1769 system power supply before sliding the module onto the rail framework. Hot-swapping modules on a 1769 backplane risks creating inductive voltage arcs across the bus pins, which can corrupt the active processor register memory or trigger an unrecoverable system fault.