1785-ME16 Allen-Bradley PLC-5 Enhanced Processor Backup Memory

Product Description

The Allen-Bradley 1785-ME16 serves as a specialized non-volatile storage solution for the PLC-5 controller family. It provides 16K words of EEPROM memory, allowing the system to preserve critical user programs and configuration data without the need for continuous battery power. This module significantly enhances system reliability by enabling the processor to automatically reload the executive program during power-up sequences.

Technical Specifications

Engineering Advantages

• Automatic Program Recovery: The module eliminates the risk of memory loss during extended power outages. It triggers an automatic load of the ladder logic into the processor RAM immediately upon power restoration.
• Data Integrity Protection: A physical, removable hardware jumper allows engineers to lock the memory. This prevents unauthorized or accidental overwriting of the verified control program.
• Broad System Compatibility: The 1785-ME16 integrates seamlessly with various enhanced PLC-5 processors, including both standard versions and high-performance Ethernet-enabled models like the PLC-5/20E and PLC-5/80E.
• Industrial Durability: Built for high-vibration and extreme thermal environments, the module maintains data stability within a wide operational temperature range from 0°C to 60°C.
• Safe Installation Protocols: The hardware design ensures a secure fit within the processor slot. Consequently, users must strictly adhere to de-energized installation procedures to prevent electrostatic damage or logic corruption.

FAQs

• Can I install the 1785-ME16 while the PLC-5 processor is running?
  • No. You must remove power from the processor before inserting or removing the memory module. Handling the module while the system is energized often results in permanent hardware failure or complete data loss.
• How does the write protection jumper function?
  • The jumper acts as a hardware interlock. When you remove the jumper, the module enters a read-only state, effectively blocking any save commands from the programming software.
• Does this module replace the need for a PLC battery?
  • While the 1785-ME16 stores the program permanently, the internal processor battery still maintains the real-time clock and current data table values. The memory module ensures the core program survives even if the battery fails.