Allen-Bradley 1747-M1 Memory Device

The Allen-Bradley 1747-M1, also cataloged as the 1747-M1 Memory Device, operates as a dedicated hardware component for program and data table storage within the SLC 500 architecture.

Configured for non-volatile program retention in SLC 500 controller environments, the Allen-Bradley 1747-M1 (1747-M1 Memory Device) provides direct EEPROM-based execution support for program/data table storage and controller memory backup operations across SLC chassis configurations.

Suffix Breakdown & Model Matrix

• 1747: SLC 500 chassis family identifier

• M1: EEPROM memory module designation for program and data retention functions

No further factory-defined suffix segmentation is available for this single-part configuration.

Hardware Specifications

PLC Backplane Memory Transaction Behavior (Allen-Bradley SLC Architecture)

The 1747-M1 memory device integrates into the SLC 500 backplane environment where memory operations are synchronized with controller scan cycles. Within this architecture, backplane bus communication velocity governs the update consistency between EEPROM storage blocks and CPU execution cycles.

The module operates independently of field I/O traffic and does not participate in deterministic EtherNet/IP process data exchange. Firmware-level compatibility is governed by SLC 5/01 and SLC 5/02 controller memory mapping constraints, with EEPROM write cycles executed under non-real-time background scheduling to prevent scan time interference.

Frequently Asked Questions (FAQ)

Q: Does the 1747-M1 support hot-swap in a live SLC 500 chassis?
A: No. Memory device insertion or removal requires controller power down to prevent EEPROM corruption and backplane addressing errors.

Q: Is program retention affected by backplane voltage fluctuation?
A: The EEPROM storage is non-volatile; however, unstable backplane conditions during write cycles may result in incomplete memory commit states.

Q: Can the module be used across different SLC CPU generations?
A: It is compatible with SLC 5/01 and SLC 5/02 controllers only, based on firmware and memory mapping constraints.

Field Installation Guidelines

• Ensure controller chassis power is fully disconnected before insertion or removal

• Align module correctly with SLC 500 backplane connector before seating

• Avoid electrostatic discharge during handling; use grounded wrist strap

• Verify controller firmware compatibility prior to memory transfer operations

• Do not force insertion; mechanical misalignment can damage backplane pins

• After installation, perform memory verification via controller diagnostics routine