Product Overview

The Allen-Bradley 1785-ME32 is a high-reliability Electrically Erasable Programmable Read-Only Memory (EEPROM) module specifically engineered for the PLC-5® controller platform. This module provides 32K words of non-volatile storage, acting as a critical fail-safe for user programs and system configurations. By installing the 1785-ME32, industrial operators ensure that essential logic, calibration tables, and device parameters remain preserved during extended power outages or battery failures, eliminating the need for manual program reloading.

This memory device is designed for seamless integration into the processor's dedicated memory port. It allows for multiple overwrite cycles, enabling engineers to update machine logic as system requirements evolve. The 1785-ME32 is particularly essential in remote or unmanned installations where maintaining system uptime is paramount and physical access for troubleshooting is limited.

Technical Performance and Environmental Resilience

The 1785-ME32 is built to sustain industrial-grade performance in high-interference environments, providing a robust layer of protection for digital assets.

• Data Integrity and Backup: Provides a 32K word storage capacity that serves as a permanent backup for the controller's RAM, preventing data corruption or loss.

• Superior Noise Immunity: Features advanced electromagnetic compatibility (EMC) protection, including ESD immunity up to 6 kV (contact) and 8 kV (air), as well as radiated RF shielding against signals from 30 MHz to 2700 MHz.

• Mechanical Durability: Engineered to withstand significant mechanical stress, with an operational shock rating of 30g and a non-operating limit of 50g, ensuring performance in heavy manufacturing sectors.

• Thermal Range: Optimized for standard industrial environments with an operating temperature window of 0°C to 60°C (32°F to 140°F) and extreme storage tolerance from -40°C to 85°C.

Technical Specifications

• Manufacturer: Allen-Bradley (Rockwell Automation)

• Model Number: 1785-ME32

• Type: Non-Volatile EEPROM Memory Module

• Memory Capacity: 32,000 (32K) Words

• Platform Compatibility: PLC-5 Systems (Enhanced and Ethernet Processors)

• Backplane Current: 2.5mA @ 5V DC

• Programming Method: User-modifiable and erasable via controller software

• Humidity Tolerance: 5% to 95% (Non-condensing)

• Weight: 0.08 kg (0.17 lbs)

• Physical Dimensions: 13.5 x 7.1 x 1.0 cm

Installation and Maintenance Guidelines

• Safe Insertion: To prevent damage to internal CMOS circuitry, the I/O chassis and processor must be completely powered down before the 1785-ME32 is inserted or removed from the memory port.

• Program Loading: Once installed, the module can be configured to automatically load the stored program into the processor's RAM upon power-up, providing an autonomous recovery solution.

• Scalable Architecture: While providing local storage, the module works in tandem with the PLC-5’s capability to manage up to 3072 analog I/O points and 32 remote I/O chassis per link.

• Diagnostic Verification: System status lights on the main PLC-5 processor can be used to verify successful data transfers between the EEPROM and the active logic controller.