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The 1756-L55M14 is a ControlLogix Logix5555 controller module equipped with 1.5 Mbytes of nonvolatile user memory. It is designed to reside in any slot of a ControlLogix chassis and requires a 1756-BA1 or 1756-BA2 lithium battery to maintain the controller's memory and real-time clock during power loss.
1.5MB User Memory
32-Task Multitasking
Any-Slot Chassis Placement
This controller supports a multitasking software environment with up to 32 configurable tasks, providing a flexible control platform for sequential, process, drive, and motion applications. It communicates across the ControlLogix backplane to interface with various I/O and communication modules, drawing a maximum of 1.25 A at 5.1V DC.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Allen-Bradley 1756-L55M14 PROCESSOR MODULE Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Oil and Gas
Used for distributed control of remote wellhead production and refinery processes. The controller supports multiple tasks for managing complex PID loops and real-time data acquisition across extensive ControlNet or EtherNet/IP networks.
Automotive Manufacturing
Applied in high-speed assembly lines and robotic cell coordination. Its multitasking environment allows for simultaneous execution of sequential logic and motion control, ensuring precise synchronization of powertrain and body shop operations.
Power Generation
Implemented in power plant balance-of-plant (BOP) control and substation automation. The 1.5 MB memory capacity provides sufficient space for extensive diagnostic logic and communication with protective relaying equipment.
Food and Beverage
Utilized in high-volume bottling, canning, and batch processing applications. It manages complex recipe handling and high-speed discrete I/O, supporting seamless integration with factory-wide Information Systems for production tracking.
Pharmaceutical Production
Deployed in validated processes requiring rigorous batch control and data integrity. The controller architecture supports the high-level programming and multitasking necessary for maintaining precise environmental and chemical parameters.
Material Handling
Used in large-scale automated storage and retrieval systems (AS/RS) and baggage handling. It coordinates high-axis-count motion control and complex sorting algorithms, occupying any available slot in the chassis for flexible system design.
Shielding and Grounding Requirements：To limit the effects of electromagnetic interference (EMI), use shielded twisted-pair cable for all RTD or resistance inputs. The shield must be grounded at only one end, typically at the SLC chassis ground, to prevent ground loops.
Sensor Failure Diagnostics：The 1746-NR4 provides continuous diagnostics for open-circuit and short-circuit conditions. When a failure is detected, the module sets the corresponding error bit in the channel status word, which can be configured to drive the input data to a safe state (upscale or downscale).
Module Calibration Cycles：The module is calibrated at the factory; however, recalibration is recommended every 12 months or if environmental conditions vary significantly. Calibration requires a high-precision decade box with an accuracy of at least 0.01%.
What is the available user memory capacity for the 1756-L55M14 controller?
The 1756-L55M14 is equipped with 1.5 Mbytes of user memory and is designed for larger control applications requiring extensive data storage.
Which communication options are supported by the 1756-L55M14 within a ControlLogix chassis?
The 1756-L55M14 supports EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, and Remote I/O through various 1756 communication bridge modules.
Does the 1756-L55M14 require a specific battery for memory back-up?
Yes, the 1756-L55M14 uses the 1756-BA1 or 1756-BA2 lithium battery to maintain the controller's memory when the power is removed from the chassis.
How many 1756-L55M14 controllers can be placed in a single ControlLogix chassis?
You can install multiple 1756-L55M14 controllers in the same chassis, as the ControlLogix system supports multiple controllers performing independent tasks.
What is the backplane current consumption for the 1756-L55M14 at 5.1V DC and 24V DC?
The 1756-L55M14 draws a maximum of 1.25 A at 5.1V DC and 0.014 A at 24V DC from the ControlLogix backplane.
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