1785-ME32 | Allen Bradley | PLC 5 EEPROM Memory Backup Module

Product Overview

The Allen Bradley 1785-ME32 functions as a specialized EEPROM (Electrically Erasable Programmable Read-Only Memory) module designed for the classic PLC-5 processor platform. This hardware serves a critical role in system disaster recovery by providing a non-volatile backup of the controller's executive tasks, ladder logic, and configuration data. By utilizing the 1785-ME32, engineers protect their automation logic against battery failure or long-term power loss. The module stores up to 32 Kilowords of data, acting as a permanent "gold master" copy of the industrial application.

Technical Specifications

Engineering Advantages

• Permanent Non-Volatile Security: The 1785-ME32 eliminates the risk of "memory loss" during extended shutdowns. Unlike volatile RAM which relies on internal batteries, this EEPROM retains the entire instruction set indefinitely without power, ensuring the machine resumes operation immediately upon power restoration.

• Rapid Disaster Recovery: In the event of a processor hardware failure, maintenance teams simply move the 1785-ME32 to a replacement PLC-5 controller. The new processor automatically loads the stored 32 Kiloword program, bypassing the need for a laptop or original source code files in the field.

• Robust Data Integrity: The module handles high-speed I/O scan times—achieving rates as fast as 3 ms at 230.4 kbits/s. This allows the memory module to support large-scale architectures with up to 93 total I/O chassis without introducing latency into the communication link.

• Industrial Hardened Storage: Designed for the rigors of factory environments, the module fits securely into the dedicated memory slot of the PLC-5. It withstands the thermal fluctuations and electromagnetic interference (EMI) typical of heavy-duty control panels.

• Dual-Memory Architecture: The inclusion of 6 Kilowords of SRAM provides a high-speed buffer for data handling. This helps the processor manage up to 3072 analog I/O points while maintaining a stable backup of the core logic.

FAQs

• Is the 1785-ME32 100% Brand New?

  Yes. We supply this 1785-ME32 memory module as 100% Brand New and original. Each unit arrives in its original factory packaging, ensuring the EEPROM chips have zero previous write cycles and possess full data retention life.

• How do I transfer the program from the PLC to the 1785-ME32?

  You perform the transfer via the programming software (RSLogix 5). Navigate to the processor properties and execute the "Store to EEPROM" command. This action writes the current RAM contents into the non-volatile memory of the 1785-ME32.

• Will this module work with all PLC-5 processors?

  The 1785-ME32 supports standard PLC-5 processors. Always verify the memory slot capacity and firmware revision of your specific 1785 processor to ensure it recognizes the 32 Kiloword sizing.

• Does the module require a battery?

  No. The EEPROM technology inside the 1785-ME32 does not require a battery to retain data. However, your PLC-5 processor still requires a battery if you wish to maintain the volatile RAM and real-time clock during power-down.