- ControlLogix 5550 controller used with the 1756-M2 1 MB memory module
- No embedded Ethernet capability is established by the reviewed controller documentation
- Project, communications and chassis record are essential replacement items
1756-L1M2 is a ControlLogix 5550 controller configured around the removable 1756-M2 1 MB memory module.
It is a chassis controller, so the original rack and communication design—not just the processor label—determine the system it can restore.
Safeguard the application backup and verify the memory module, power budget and communication modules before any exchange.
Availability, condition, price, and shipping time for 1756-L1M2 are confirmed during quotation.
Allen-Bradley 1756-L1M2 ControlLogix Memory Board Manuals, Product Family, Links
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
- Verify the installed 1756-M2 1 MB memory module before quoting a replacement
- Preserve the controller project before removing the original CPU
- Do not substitute memory hardware from label similarity alone
- Include the documented 5.1 V and 24 V backplane current in the rack budget
- Check the loaded supply with every I/O and communication module installed
- Investigate chassis power faults before replacing a controller repeatedly
- Archive the application, slot layout and communication configuration
- Identify the actual programming and network access route before removal
- Validate I/O ownership and system behavior under controlled conditions after restore
- ControlLogix 5550 machine-control projects sized within the 1 MB user-memory and 150 KB I/O-memory limits
- Chassis-based sequential and process-control systems using compatible ControlLogix I/O modules
- Networked controller installations using separate compatible ControlLogix communication modules