PLC Memory Modules | Allen-Bradley 1745-M1

The 1745-M1 is a non-volatile EEPROM memory module engineered for Allen-Bradley SLC 100 and SLC 150 programmable logic controllers. Belonging to the Bulletin 1745 hardware series, this compact memory cartridge installs directly into the host controller to provide secure, non-volatile storage for user logic and configuration data up to a maximum capacity of 1,200 words.

Non-Volatile Program Backup and Retention

The 1745-M1 protects critical operating logic against data loss caused by power outages or internal RAM battery depletion. Once a ladder logic program is saved to the EEPROM chip, the controller can retain its application program indefinitely without requiring battery back-up power, making it ideal for remote or legacy industrial installations where long-term system stability is required.

Module Installation and System Integration

Designed for plug-in operation, the module fits into the designated memory expansion socket on SLC 100 and SLC 150 CPU units. Programmers can transfer user code between the controller's internal RAM and the 1745-M1 EEPROM using an SLC handheld programmer or PC software, enabling simplified program duplication across multiple machines or fast restoration during maintenance.

Technical Specifications

Frequently Asked Questions

Q: What is the primary advantage of using the 1745-M1 EEPROM module over standard internal RAM in an SLC 100/150 controller? A: The 1745-M1 provides non-volatile storage, meaning user programs (up to 1,200 words) remain safely stored even if the controller loses main power and its internal RAM battery drains completely.

Q: Can the 1745-M1 memory module be reprogrammed? A: Yes, as an Electrically Erasable Programmable Read-Only Memory (EEPROM) cartridge, the 1745-M1 can be written to, erased, and re-written using compatible Bulletin 1745 programming tools.