Allen-Bradley 1756-L55M12 ControlLogix 5555 Controller

Description

The Allen-Bradley 1756-L55M12 is a ControlLogix 5555 processor module designed for high-performance industrial control applications. The 1756-L55M12 controller provides 750 Kbytes of user memory for data and logic programs, along with 208 Kbytes of dedicated I/O memory, operating without nonvolatile memory storage. The unit has an open-style enclosure rating and supports various communication networks across the ControlLogix platform, including ControlNet, EtherNet/IP, DH+, DeviceNet, and Universal Remote I/O networks. Multiple 1756-L55 controllers can be integrated into a redundant controller system configured within a ControlNet network.

Features

• 750 Kbytes user memory for data and logic
• 208 Kbytes dedicated I/O memory
• Fast program scan time of 0.08 milliseconds
• Supports up to 128,000 total I/O points
• Supports up to 4,000 analog inputs and 2,000 analog outputs
• Multi-protocol communication support across EtherNet/IP, ControlNet, DeviceNet, DH+, and Universal Remote I/O
• Redundancy capability over ControlNet networks
• Compatible with serial cables 1756-CP3 or 1747-CP3

Applications

• Industrial PLC and DCS control systems
• High-speed discrete logic processing
• Multi-axis and complex analog process control
• Redundancy systems via ControlNet networks
• Distributed plant automation systems

Technical Specifications

Installation Guidelines

• Ensure power to the ControlLogix chassis is disconnected prior to installing or removing the module.
• Mount the unit into any available slot of a 1756 ControlLogix chassis.
• Maintain adequate panel ventilation to keep ambient temperatures within 0 to 60 degC during operation.
• Use 1756-CP3 or 1747-CP3 serial cables for direct serial interface connectivity.
• Maintain proper ground connection on the chassis backplane to mitigate EMI/RFI interference.
• Install a fresh 1756-BA1 or 1756-BATM lithium battery to retain volatile memory when the module is powered down.