1756-ESMCAP | Allen Bradley | ControlLogix Capacitor-Based Energy Storage Module

Product Overview

The Allen Bradley 1756-ESMCAP serves as a high-reliability, capacitor-based Energy Storage Module (ESM) designed for the ControlLogix 5570 (1756-L7x) controller series. This module provides the necessary power to flush volatile controller memory to non-volatile storage during a power loss event. By utilizing advanced capacitor technology, the 1756-ESMCAP eliminates the need for traditional lithium batteries, thereby removing maintenance requirements associated with battery testing and replacement. It fits into the front of the controller, maintaining a slim profile while ensuring data integrity in critical automation environments.

Technical Specifications

Engineering Advantages

• Maintenance-Free Data Protection: The 1756-ESMCAP utilizes capacitors rather than chemical batteries to hold a charge. This transition eliminates the periodic "battery low" alarms and the mandatory replacement schedules typically required every 1-2 years, significantly reducing long-term OpEx for remote or unmanned facilities.

• Rapid Charging Cycle: The module reaches a full functional charge within minutes of chassis power-up. This ensures the controller gains protection almost immediately, whereas traditional batteries may require longer periods to reach optimal voltage levels after a deep discharge.

• Elimination of Hazardous Materials: By removing lithium components, this module simplifies shipping and disposal compliance. Facilities no longer need to manage the environmental hazards and storage regulations associated with lithium-metal batteries.

• Optimized Thermal Performance: Despite a maximum power dissipation of 13.3 Watts, the module maintains stable operation up to 60°C. The open-style enclosure leverages the natural convection airflow within the ControlLogix chassis, preventing heat localized hotspots that could degrade the life of the processor.

• Seamless Mechanical Integration: The module snaps directly onto the front of the L7 series controller. This design requires zero additional DIN rail space and maintains a clean, cable-free aesthetic within the control cabinet, allowing for easy visual inspection of the module status LEDs.

FAQs

• Is the 1756-ESMCAP supplied as Brand New?

  Yes. We supply this 1756-ESMCAP as 100% Brand New and original. Each unit arrives in its original factory packaging, ensuring the internal capacitors are pristine and have zero previous charge-discharge cycles.

• Can I use the 1756-ESMCAP with older 1756-L6x controllers?

  No. The 1756-ESMCAP is specifically keyed and designed for the 1756-L7x (ControlLogix 5570) series. Older L6x controllers utilize the 1756-BA1 or 1756-BA2 lithium batteries for memory retention.

• Does this module require a specific firmware version?

  While the ESM itself is a hardware component, the 1756-L7x controller must run compatible firmware (typically Version 18 or higher) to properly recognize and manage the energy storage module. Always check your processor's revision before installation.

• What happens if the ESM is removed while the controller is powered?

  Removing the ESM while the system is under power will trigger a minor fault in the controller. The processor will continue to run, but it will lose the ability to save the project to non-volatile memory if the main chassis power fails. Always ensure the ESM is securely seated.