1756-L72S/K | Allen Bradley | GuardLogix Conformal Coated PAC

Allen Bradley 1756-L72S/K ControlLogix GuardLogix 5570 Safety Processor

Product Overview

The 1756-L72S/K (1756-L72S/K) is a high-performance safety controller belonging to the Allen-Bradley GuardLogix 5570 series. This specific "K" variant signifies Conformal Coating, providing enhanced protection against harsh environmental contaminants, humidity, and chemical exposure, making it ideal for corrosive industrial settings.

The 1756-L72S/K integrates standard control, safety control, and high-speed motion in a single chassis-based unit. It is designed to meet the most stringent global safety standards, including SIL 3 and PLe, when paired with its mandatory safety partner (1756-L7SP). By utilizing a single controller for both standard and safety tasks, users can significantly reduce hardware costs and simplify system architecture.

Detailed Technical Specifications

The 1756-L72S/K delivers robust processing power with dedicated safety partitions:

• Manufacturer: Allen-Bradley (Rockwell Automation)

• Model/Catalog Number: 1756-L72S/K

• Product Line: GuardLogix 5570

• Standard User Memory: 4 MB

• Safety Memory: 2 MB

• I/O Memory: 0.98 MB

• Non-Volatile Memory: 1 GB Secure Digital (SD) card included (1784-SD1)

• Safety Partner Required: 1756-L7SP (mandatory for SIL 3/PLe)

• I/O Capacity: 128,000 total digital I/O; 4,000 analog I/O

• Communication Interface: 1 USB 1.1 Full Speed port (supports EtherNet/IP, ControlNet, DeviceNet via modules)

• Processor Scan Time: 0.08 ms per K of logic

• Current Draw: 800 mA @ 5.1V DC; 5 mA @ 1.2V DC

• Energy Storage: 1756-ESMCAP (Integrated Capacitor), 1756-ESMNSE, or 1756-ESMNRM

• Environmental Protection: Conformal Coated (K-Rating)

• Operating Temperature: 0°C to +60°C (32°F to 140°F)

• Safety Certification: SIL 3 (IEC 61508), PLe (ISO 13849-1)