Allen-Bradley 1747-M12 SLC 500 EPROM Memory Module

The 1747-M12 is a non-volatile 64K EPROM memory module manufactured by Allen-Bradley for the SLC 500 programmable logic controller platform. It provides permanent storage for user programs and processor data, protecting control logic against data loss caused by battery failure or prolonged power outages. Designed to plug directly into compatible SLC 500 processors, the 1747-M12 ensures fast program recovery and reliable system restores in industrial automation environments.

Memory Capacity and Technology

Featuring 64 KB of EPROM (Erasable Programmable Read-Only Memory) storage capacity, the module retains user ladder logic programs and system configuration settings without requiring continuous backplane or battery power. It is ideal for safeguarding critical PLC applications and serving as a master backup image for rapid controller restoration.

Hardware Installation and Compatibility

The 1747-M12 installs directly into the dedicated memory module socket located on compatible SLC 500 CPU boards, including select SLC 5/01, 5/02, 5/03, 5/04, and 5/05 controllers. Once installed, processor operating modes can be configured via programming software (such as RSLogix 500) to automatically load the EPROM contents into processor RAM upon power-up or memory corruption detection.

Frequently Asked Questions

Q: Does the 1747-M12 memory module require battery power to retain data? A: No, as an EPROM device, the 1747-M12 provides non-volatile storage and retains user programs and data without requiring a battery.

Q: How does the SLC processor utilize the 1747-M12 memory module during operation? A: Depending on controller configuration settings in RSLogix 500, the processor can automatically transfer stored ladder logic from the 1747-M12 into internal RAM upon system initialization or power-up.