What This Controller Is Used For

The 1756-L55M12 is a ControlLogix 5555 series programmable automation controller designed for medium to large industrial control systems. It executes control logic, processes I/O data, and manages communication between distributed modules within a ControlLogix chassis.

This controller is typically selected when greater memory capacity is required to support complex programs, multitasking, and extensive tag databases.

Core Capabilities

Execute ladder logic, function blocks, and structured text programs

Handle multiple sequential and event-driven tasks

Support deterministic control with high scanning performance

Communicate with ControlLogix I/O and communication modules via backplane

Technical Specifications

Item	Specification
Manufacturer	Allen-Bradley
Product Family	ControlLogix 5555
Catalog Number	1756-L55M12
Controller Type	Programmable Automation Controller
User Memory	12 MB
I/O Memory	Shared within controller memory
Task Support	Continuous, Periodic, Event
Maximum Tasks	32
Programs per Task	Up to 100
Backplane Compatibility	1756 ControlLogix chassis
Communication	Via ControlLogix communication modules
Operating Voltage	5 V DC (backplane supplied)
Typical Current Draw	~1.25 A @ 5 V DC
Operating Temperature	0 … 60 °C
Storage Temperature	-40 … 85 °C
Enclosure Rating	Open-type (panel mount)
Programming Software	RSLogix 5000

Typical Industrial Use

Automated production lines with multiple process zones

Batch processing systems requiring high-volume label counting

Material handling systems with coordinated motion and sequential control

Legacy ControlLogix platforms requiring memory-matched replacement parts

Model-Focused FAQ

Common Problem

What does "M12" on the controller represent?

It indicates 12MB of user storage capacity, distinguishing it from other L55 models.

Does the 1756-L55M12 have built-in Ethernet functionality?

No. Network connectivity requires a separate ControlLogix communication module.

Is this controller suitable for motion control?

It can coordinate motion control with dedicated motion modules but lacks onboard motion control functionality.

What happens if memory usage exceeds 12MB?

The controller will reject any additional logic or tags exceeding available memory.

Global Supply Service

One-Year Warranty Support – PLC Export

Automation System Continuity

We support the ControlLogix platform with memory-specific controllers like the 1756-L55M12, enabling customers to maintain existing systems without forced redesigns.

Practical Control Solutions

By precisely matching controller capacity to actual application requirements, we effectively reduce downtime and minimize engineering changes.

Get Your Fastest Response Here

Contact Method	Details
Email	sales3@mooreplc.com
WhatsApp / Phone	+86 180 2071 4662

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