1785-MR | Allen-Bradley 4K RAM Memory Module for PLC-5/15

Description

The Allen-Bradley 1785-MR is a 4K RAM memory module engineered for use with PLC-5/15 processors. Designed to provide non-volatile memory storage when paired with an EPROM module, it enables reliable data handling and temporary program storage within control systems. The 1785-MR supports critical control operations that require quick read/write access and stable data retention during runtime.

Although now discontinued by the manufacturer, the 1785-MR remains widely used for maintaining and servicing legacy Allen-Bradley PLC-5 systems in industrial environments.

Technical Specifications

• Manufacturer: Allen-Bradley

• Model Number: 1785-MR

• Product Type: RAM Memory Module

• Memory Capacity: 4K words

• Compatible Controller: PLC-5/15 Processor

• Memory Type: Volatile RAM (used with EPROM for permanent storage)

• Category: PLCs / Machine Control

• Subcategory: PLC Module / Rack

• Weight: 0.03 lbs (0.014 kg)

• Status: Discontinued by manufacturer (available as replacement or service part)

• Factory Warranty: Not applicable

• Replacement Warranty: 2-year limited coverage (third-party or distributor dependent)

Application Scenarios

The 1785-MR is suitable for industrial control systems that require reliable temporary data storage during PLC operations. It is commonly used in:

• Legacy PLC-5 automation systems

• Process control and manufacturing environments

• Equipment upgrades and maintenance of older control architectures

• Memory expansion for existing PLC-5/15 controllers

Comparison with Similar Models

• 1785-MR: 4K RAM module for PLC-5/15 processors

• 1785-MJ: 8K EEPROM module for program retention

• 1785-ME16: 16K EPROM module for expanded permanent memory

FAQs

Q1: Is the 1785-MR still supported by Allen-Bradley?
A1: The model is discontinued, but it remains compatible with legacy PLC-5/15 systems and can be sourced as a service replacement.

Q2: Does this module retain data when power is off?
A2: No. As a RAM-based device, data is lost when power is removed unless backed up by an EPROM module.

Q3: Can the 1785-MR be used with other PLC-5 processors?
A3: It is primarily intended for the PLC-5/15 but may function with select compatible units within the same architecture.

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Allen-Bradley 1785-MR 4K RAM Memory Module for PLC-5/15