- 7.5 MB total data and logic memory with a maximum of 3.5 MB available for data
- 208 KB I/O memory and no listed onboard nonvolatile memory
- Higher chassis-current demand than the lower-memory L55 configurations
1756-L55M16 is the highest-capacity memory configuration listed for the ControlLogix 5555 controller family.
The 7.5 MB total is qualified by a 3.5 MB maximum for data, so project composition—not only total size—must be checked.
Preserve the project archive and verify Series A identity, firmware, battery, and full chassis-power margin before replacement.
Availability, condition, price, and shipping time for 1756-L55M16 are confirmed during quotation.
Allen-Bradley 1756-L55M16 ControlLogix Controller 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.
- 7.5 MB is the total published data and logic memory
- Data usage is limited to a maximum of 3.5 MB
- 208 KB is separately allocated to I/O data
- The controller draws 1.48 A at 5.1 V DC from the backplane
- The documented 24 V DC backplane demand is 14 mA
- Calculate margin using every module installed in the chassis
- No onboard nonvolatile memory is listed for the M16 allocation
- Retain a verified project archive containing all controller and network configuration
- Confirm battery condition before shutdown or controller removal
- Large ControlLogix 5555 machine-control projects within the documented memory allocation
- Process and sequential-control systems requiring more logic capacity than lower-memory L55 controllers
- Supported redundant-controller systems using the approved firmware and hardware combination