- 750 KB data and logic memory with 208 KB reserved I/O memory
- No onboard nonvolatile project memory is listed for the M12 configuration
- Supported in the documented ControlLogix redundancy Revision 11 configuration
1756-L55M12 is a ControlLogix 5555 controller with 750 KB of data and logic memory.
Unlike the 1756-L55M22 configuration, 1756-L55M12 does not include documented onboard nonvolatile memory. Project recovery therefore depends on a maintained engineering archive and the condition of the controller battery.
Before replacement, confirm the Series A identity, firmware revision, redundancy-partner compatibility, chassis power capacity, and saved controller project.
Availability, condition, price, and shipping time for 1756-L55M12 are confirmed during quotation.
Allen-Bradley 1756-L55M12 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.
- 750 KB is allocated to data and logic and 208 KB is allocated to I/O
- No onboard nonvolatile memory is listed for the 1756-L55M12 allocation
- A current external project archive is required for dependable recovery
- 1756-L55M12 is listed in the documented ControlLogix Revision 11 redundancy scope
- Primary and secondary controllers must use the approved redundancy combination
- Firmware and redundancy-module compatibility must be verified before synchronization
- 1756-BA1 is the documented controller battery
- 1756-CP3 or 1747-CP3 is used for the local serial programming connection
- Network connectivity depends on separate compatible ControlLogix communication modules
- ControlLogix 5555 machine and process-control projects within the M12 memory limits
- Revision 11 redundant ControlLogix systems using the approved controller combination
- Chassis-based automation systems using separate ControlLogix network interfaces