Product Overview

The Allen-Bradley 1785-ME16 is a high-reliability, non-volatile memory expansion module designed for the PLC-5® processor family. Utilizing Electronically Erasable Programmable Read-Only Memory (EEPROM) technology, this module provides 16K words of secure storage for critical user programs and system data. It serves as a vital fail-safe mechanism, allowing the PLC to automatically reload the control logic from the EEPROM into the processor's RAM during power-up cycles, thereby eliminating the risk of program loss due to battery failure or long-term power outages.

This compact module is engineered for seamless integration into the memory expansion slot of various enhanced and Ethernet-enabled PLC-5 controllers. By providing a permanent hardware backup of the automation logic, the 1785-ME16 ensures maximum system uptime and protects industrial processes from unauthorized or accidental code modifications.

Data Security and Hardware Protection

The 1785-ME16 is built with industrial-grade security features to maintain the integrity of the stored control program.

• Write-Protection Jumper: Features a physical, removable jumper that allows maintenance personnel to hardware-lock the memory. This prevents the processor from overwriting the stored program, shielding the logic from software-based errors or unauthorized changes.

• Non-Volatile Storage: Unlike standard RAM, the EEPROM technology does not require battery power to retain data, making it an ideal long-term archival solution for machine parameters and logic.

• Automatic Load Configuration: The PLC-5 can be configured to "Load on Power-Up" or "Load on Fault," ensuring the system returns to a known good state without manual intervention.

Technical Specifications

• Manufacturer: Allen-Bradley (Rockwell Automation)

• Model Number: 1785-ME16

• Memory Capacity: 16K Words

• Technology Type: EEPROM (Electronically Erasable Programmable Read-Only Memory)

• Processor Compatibility: PLC-5/11, 5/20, 5/30, 5/40, 5/60, 5/80 (including E and L versions)

• 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 Resistance: 2g @ 10–500Hz

• Operational Shock: 15g (Peak Acceleration)

• Weight: 0.08 kg (85.05 grams)

• Dimensions: 13.5 x 7.1 x 1.0 cm

Installation and Environmental Durability

• Safe Handling: This module must be installed or removed only when the processor chassis is completely powered down. Removing the module while the backplane is active can lead to immediate data corruption or permanent hardware damage.

• Ruggedized Design: Built to withstand the harsh conditions of factory floors, the module is rated for up to 95% non-condensing humidity and features high-level electromagnetic interference (EMI) shielding.

• Global Compliance: The 1785-ME16 holds CSA, UL, and CE certifications, meeting the rigorous safety and quality standards required for global industrial deployment.