Allen Bradley 1756-L72 | ControlLogix 5570 Series Processor Module

Product Description

The Allen Bradley 1756-L72 is a high-performance controller from the ControlLogix 5570 family, designed for demanding automation systems requiring large memory capacity, high-speed processing, and full redundancy support. With advanced communication options, robust I/O handling, and multiple programming language support, it provides flexibility and reliability for complex industrial applications.

Technical Specifications

• Manufacturer: Allen Bradley

• Category: PLCs

• Product Line: ControlLogix 5570

• Part Number: 1756-L72

• Weight: 0.56 lbs (0.26 kg)

• Module Type: Processor Module

• User Memory: 4 MB

• I/O Memory: 0.98 MB

• Nonvolatile Memory: 1 GB (1784-SD1 included), expandable to 2 GB (1784-SD2)

• Maximum Digital I/O: 128,000 points

• Maximum Analog I/O: 4,000 points

• Communication Ports: 1 USB port

• USB Functions: Programming, configuration, and online edits

• Current Draw (1.2 VDC): 5 mA

• Current Draw (5.1 VDC): 800 mA

• Power Dissipation: 2.5 W

• Thermal Dissipation: 8.5 BTU/hr

• Isolation Voltage: 30 V continuous

• Operating Shock: 30G

• Relative Humidity: 5–95% non-condensing

• Redundancy: Full support for redundant systems

• Programming Languages Supported: Relay Ladder, Structured Text, Function Block, Sequential Function Chart (SFC)

• Enclosure: None (open module design)

Application Scenarios

• Large-scale automation systems requiring high I/O capacity

• Redundant control systems for critical industrial processes

• Applications needing flexible programming language support and fast scan times

FAQ

Q: What type of memory does the 1756-L72 include?  A: It has 4 MB user memory, 0.98 MB I/O memory, and ships with a 1 GB nonvolatile SD card (expandable to 2 GB).

Q: Does the controller support redundancy?  A: Yes, the 1756-L72 provides full redundancy support for ControlLogix systems.

Q: Which programming languages are supported?  A: Relay Ladder, Structured Text, Function Block, and SFC.