The Allen-Bradley 1756-L1 is a foundational processor module within the ControlLogix (Logix5550) automation family. As a chassis-based controller, it is designed to reside in any slot of a 1756 ControlLogix chassis, facilitating seamless communication with I/O modules and other controllers across the ControlBus backplane. This module provides a modular and flexible control solution for various industrial automation tasks.
Features
Modular Design: Occupies a single slot in any standard 1756 ControlLogix chassis.
Memory Expansion: Features 64 KB of built-in user memory, with support for expansion via 1756-M1 (128 KB), 1756-M2 (512 KB), or 1756-M3 (2 MB) memory modules.
Data Retention: Supports 1756-BA1 or 1756-BA2 lithium battery modules to maintain volatile memory during power-down cycles.
Backplane Communication: High-speed data exchange via the ControlLogix backplane.
Technical Specifications
Brand
Allen-Bradley
Product Line
ControlLogix (Logix5550)
Module Type
Processor / Controller
User Memory
64 KB
Backplane Current (5V DC)
120 mA
Backplane Current (24V DC)
2 mA
Power Dissipation
4.1 Watts
Isolation Voltage
30V (Continuous)
Slot Width
1 Slot
Operating Temperature
0 to 60 degC (32 to 140 degF)
Installation Guidelines
ESD Protection: Always use a grounded wrist strap when handling the module to prevent electrostatic discharge damage to internal components.
Power Down: Ensure the chassis power is disconnected before inserting or removing the processor module from the backplane.
Slot Placement: The 1756-L1 can be installed in any slot of a 1756 chassis; ensure the module is fully seated and the top/bottom latches are secured.
Battery Installation: Install the compatible lithium battery module (1756-BA1 or 1756-BA2) prior to operation to ensure program retention.
Environment: Maintain adequate airflow within the cabinet to ensure the module operates within its specified temperature range of 0 to 60 degC.
FAQ
Does this module include a memory card?
No, the 1756-L1 comes with 64 KB of built-in memory. External memory expansion modules (1756-M1, 1756-M2, or 1756-M3) must be purchased separately if additional memory is required.
Is this module compatible with modern ControlLogix chassis?
Yes, the 1756-L1 is compatible with standard 1756 ControlLogix chassis, provided the system architecture supports the specific Logix5550 processor generation.
