Description
Description
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
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Modular Design: Occupies a single slot in any standard 1756 ControlLogix chassis.
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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.
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Data Retention: Supports 1756-BA1 or 1756-BA2 lithium battery modules to maintain volatile memory during power-down cycles.
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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
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ESD Protection: Always use a grounded wrist strap when handling the module to prevent electrostatic discharge damage to internal components.
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Power Down: Ensure the chassis power is disconnected before inserting or removing the processor module from the backplane.
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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.
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Battery Installation: Install the compatible lithium battery module (1756-BA1 or 1756-BA2) prior to operation to ensure program retention.
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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.
