- 1.5 MB data and logic memory paired with 1.5 MB nonvolatile memory
- Series A identity must match the installed controller and saved project
- Supported redundancy use depends on the documented firmware combination
1756-L55M23 is a ControlLogix 5555 controller with matched 1.5 MB working and nonvolatile memory allocations.
Its stored-image behavior and memory identity are different from both the lower-capacity M22 and volatile-memory configurations.
Confirm Series A marking, stored project, firmware, battery, chassis power, and redundancy compatibility before replacement.
Availability, condition, price, and shipping time for 1756-L55M23 are confirmed during quotation.
Allen-Bradley 1756-L55M23 ControlLogix 5555 Controller Manuals, Datasheets, 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.
- 1.5 MB is allocated to data and logic memory
- 1.5 MB of matched nonvolatile memory is also documented
- Stored-image revision and load settings must be checked before startup
- Use only firmware releases that explicitly include 1756-L55M23
- Match the primary and secondary controller hardware and firmware
- Verify redundancy-module compatibility before synchronization
- 1756-BA1 is the documented controller battery
- 1756-CP3 or 1747-CP3 is used for the local serial connection
- Network operation depends on separate compatible communication modules
- ControlLogix 5555 applications requiring 1.5 MB working and nonvolatile project memory
- Supported redundant-controller installations using approved matching firmware
- Chassis-based machine and process-control systems with separate network interfaces