Product Details
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
| Feature | Specification Details |
| User Memory | 4 MB Standard |
| Safety Memory | 2 MB Integrated |
| Non-Volatile Memory | 1 GB (Included Secure Digital Card) |
| Max Digital I/O | 128,000 Points |
| Max Analog I/O | 4,000 Points |
| Tasks | 31 Standard; 1 Safety |
| Programs per Task | 100 Programs |
| Communication | 1 USB Port (Programming/Diagnostics) |
| Energy Storage | 1756-ESMCAP (Removes need for batteries) |
| Current Draw | 800 mA @ 5.1V DC; 5 mA @ 1.2V DC |
| Power Dissipation | 2.5 Watts |
| Thermal Dissipation | 8.5 BTU/hr |
Engineering Advantages
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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.
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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.
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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.
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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
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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.
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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.
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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.
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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.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
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Navigating Industrial Automation Failures: Types, Causes, and Mitigation Strategies
Modern manufacturing relies heavily on automated control systems to maximize throughput and maintain product quality. However, unplanned downtime in industrial automation can cost facility operators thousands of dollars per hour. Understanding how programmable logic controllers (PLCs), distributed control systems (DCS), and field instrumentation fail empowers engineering teams to implement robust preventive maintenance strategies.
Essential Motion Control Commands: A Practical Guide for Engineers
Automation engineers often rely on precise position and speed control to drive modern factory machinery. Modern industrial systems, such as Programmable Logic Controllers (PLCs) and Distributed Control Systems (DCS), depend heavily on standardized motion instructions. Mastering these commands ensures operational safety, protects mechanical components, and optimizes cycle times across production lines.