Allen-Bradley 1756-L62 ControlLogix 4 MB Memory Controller

Allen-Bradley 1756-L62 is a ControlLogix 5560 controller that provides 4 MB of user memory for industrial control and automation applications. The unit processes control tasks, manages system I/O, and supports multi-controller configurations within a standard 1756 chassis. It features an integrated RS-232 serial communication port and utilizes a removable lithium battery module for memory retention and clock support during power-down conditions. Nonvolatile memory storage is expanded via an optional CompactFlash card.

Features

• Built-in RS-232 serial port for programming and serial communication protocols
• 4 MB user memory capacity for program logic and data storage
• Supports up to 250 controller connections
• Nonvolatile memory backup via optional CompactFlash card
• Removable lithium battery options (1756-BA1 or 1756-BA2) for memory retention during power interruptions
• Front panel status indicators for diagnostic and operational monitoring
• Three-position mode switch (RUN, REM, PROG) for system operational control

Applications

• Industrial process automation and batch control systems
• Machine control and discrete manufacturing lines
• Distributed I/O and multi-chassis control configurations
• Motion control and axis integration

Technical Specifications

Connections/Interfaces

Installation Guidelines

• Chassis Mounting: The module can be installed in any available slot of a standard ControlLogix 1756 chassis.
• Electrostatic Discharge: Handle the device using an approved grounding wriststrap and static-safe workstation to avoid component damage.
• Battery Maintenance: Verify battery polarity when connecting the 1756-BA1 or 1756-BA2 battery. Replace batteries according to ambient operating temperature schedules to prevent memory loss.
• Serial Cable Routing: Ensure the serial cable length does not exceed 15.2 m (50 ft) when constructing custom serial interfaces.
• CompactFlash Handling: Insert or remove the CompactFlash card only when power is disconnected or the area is known to be nonhazardous to prevent electrical arcing.