Allen Bradley 1756-L72S GuardLogix 5570 Safety PAC Controller

Product Overview

The Allen Bradley 1756-L72S functions as a high-performance GuardLogix 5570 series controller, providing integrated safety and discrete control in a single platform. This processor handles SIL 3 and PLe (Performance Level e) safety applications when paired with its mandatory safety partner. It manages high-speed motion, complex safety logic, and standard process control simultaneously, eliminating the need for separate safety relays or independent systems. We supply this unit as 100% Brand New original factory stock, ensuring the hardware integrity required for critical life-safety automation.

Technical Specifications

Engineering Advantages

• Integrated Safety Architecture: The 1756-L72S executes both standard and safety instructions within the same chassis. This architecture simplifies software development in Studio 5000, as engineers use a common tag database for both safety and standard logic, reducing programming errors and commissioning time.

• Battery-Free Operation: The module utilizes the 1756-ESMCAP energy storage module. This capacitor-based technology provides sufficient power to save the project to non-volatile memory during a power loss event. This eliminates the maintenance burden and environmental hazards associated with traditional lithium batteries.

• High-Resolution Diagnostic Throughput: The integrated USB 2.0 port supports rapid firmware flashing and high-speed online edits. Unlike older serial-based processors, the 1756-L72S allows for near-instantaneous uploads and downloads, which is critical during emergency downtime recovery.

• Massive I/O Scalability: Supporting up to 128,000 digital I/O points, this controller manages large-scale manufacturing cells. It maintains consistent scan times even under heavy logic loads, ensuring that safety reaction times remain within the required performance parameters for SIL 3 compliance.

FAQs

• Does the 1756-L72S require a safety partner to function?

  Yes. To achieve SIL 3/PLe safety ratings, you must pair the 1756-L72S with the 1756-L7SP safety partner controller. The partner module provides the redundancy required to cross-check safety logic execution and ensure a fail-safe state in the event of a processor fault.

• What is the advantage of the 1GB non-volatile memory card?

  The ships-with 1GB SD card stores the user program and tag data permanently. If a processor failure occurs, maintenance personnel can simply move the SD card to a new 1756-L72S unit to restore the system without needing a programming laptop or the original source code files.

• Can I use this controller in an existing 1756 ControlLogix chassis?

  The 1756-L72S is compatible with all standard 1756-A4, A7, A10, A13, and A17 chassis. However, ensure that your power supply (e.g., 1756-PA72 or PB72) provides enough current for the processor and its safety partner, as they draw significantly more power than standard L7 series controllers.

• Is this a refurbished unit?

  No. We guarantee this 1756-L72S is 100% Brand New original Allen Bradley equipment. It arrives in the original factory box with the factory seal intact, including the pre-installed energy storage module and SD card.