Power Loss Protection Solution — Allen-Bradley 1756-ESMCAP | ControlLogix
The Allen-Bradley 1756-ESMCAP is a capacitor-based Energy Storage Module designed for the ControlLogix platform. It provides a reliable, maintenance-free bridge power source that protects controller memory and enables graceful shutdown sequences during unexpected power interruptions — a critical safeguard in continuous-process and safety-critical industrial environments.
Where This Product Is Used
The 1756-ESMCAP is specified wherever uninterrupted PLC operation and data integrity are non-negotiable:
- Oil & Gas Processing Plants — Protects SCADA and DCS-linked ControlLogix controllers from power transients on offshore platforms and refineries.
- Automotive Assembly Lines — Prevents mid-cycle faults and data corruption on high-speed robotic welding and painting cells.
- Water & Wastewater Treatment — Ensures pump and valve state data is preserved during grid fluctuations at remote lift stations.
- Pharmaceutical Manufacturing — Supports 21 CFR Part 11 data integrity requirements by preventing uncontrolled shutdowns during batch processes.
- Food & Beverage Processing — Maintains recipe and process variable data during power dips on continuous filling and packaging lines.
- Mining & Metals — Protects controllers in high-vibration, electrically noisy environments where power quality is poor.
- Power Generation & Utilities — Used in substation automation and turbine control panels requiring high availability.
Technical Specifications
- Catalog Number: 1756-ESMCAP
- Series: ControlLogix 1756
- Manufacturer: Allen-Bradley / Rockwell Automation
- Energy Storage Type: Capacitor (CAP) — maintenance-free, no battery replacement required
- Compatible Controllers: 1756-L7x series ControlLogix controllers
- Backup Duration: Sufficient to complete a controlled shutdown or data save sequence (application-dependent)
- Operating Temperature: 0 °C to 60 °C (32 °F to 140 °F)
- Storage Temperature: −40 °C to 85 °C
- Weight: Approx. 280 g
- Mounting: Direct-mount to compatible 1756-L7x controller
- Certifications: CE, UL Listed, cUL Listed, RCM
- Form Factor: Module — mounts directly to controller housing
Why Engineers Specify This Model
- No Battery Maintenance: Capacitor technology eliminates scheduled battery replacement cycles, reducing lifecycle maintenance costs and HSE risks associated with battery disposal.
- Instant Readiness: Unlike battery-backed modules, capacitors charge rapidly and are ready immediately after power restoration — no warm-up delay.
- Data Integrity on Power Loss: Allows the L7x controller to complete a non-volatile memory save (NVS) operation, ensuring program and data table integrity after an unplanned outage.
- Compact Integration: Mounts directly to the controller — no additional chassis slot consumed, preserving rack space for I/O expansion.
- Rockwell Ecosystem Compatibility: Fully validated within the Studio 5000 / RSLogix 5000 environment; no additional configuration required.
- Extended Service Life: Capacitor cells rated for the operational life of the controller, reducing total cost of ownership versus battery alternatives (1756-ESMNSE).
Complete System Bill of Materials
The 1756-ESMCAP is typically deployed as part of a complete ControlLogix control system. Common companion components include:
- 1756-L73 / L74 / L75 — ControlLogix L7x Series Controllers (host for the ESM module)
- 1756-A7 / A10 / A13 / A17 — ControlLogix Chassis (4, 7, 10, 13, or 17-slot)
- 1756-PA72 / PB72 — ControlLogix Power Supply (AC or DC input)
- 1756-EN2T / EN2TR — EtherNet/IP Communication Module
- 1756-IB16 / OB16E — Digital Input / Output Modules
- 1756-IF8 / OF8 — Analog Input / Output Modules
- 1756-RM2 / RM2K — ControlLogix Redundancy Module (for high-availability systems)
Compliance & Industry Standards
- CE Marking — Compliant with EU Low Voltage and EMC Directives
- UL 508 — Industrial Control Equipment (UL Listed)
- cUL Listed — Canadian Standards compliance
- RCM — Australian/New Zealand regulatory compliance
- IEC 61131-2 — Programmable Controllers: Equipment Requirements and Tests
- ATEX / IECEx — Consult Rockwell Automation for hazardous location variants
- ISA-12 — Applicable for installations in classified areas (verify with project engineer)
Quality Assurance & Sourcing
Konmask.com sources the 1756-ESMCAP through verified industrial distribution channels. Every unit offered is:
- Inspected for physical integrity, label authenticity, and firmware revision upon receipt
- Stored in ESD-safe, climate-controlled warehousing
- Traceable to original manufacturer documentation and lot records where available
- Shipped with original packaging and documentation
- Backed by Konmask’s sourcing guarantee — if a unit fails incoming inspection at your facility, we will replace or refund
We do not list units we cannot verify. If stock is shown as available, it is physically on-hand or confirmed inbound from a primary source.
How to Source This Part
- In-Stock Orders: Add to cart and complete checkout — most orders ship within 1–2 business days from our Hong Kong warehouse.
- Bulk / Project Quantities: Contact us at support@konmask.com for volume pricing and lead-time commitments.
- Urgent Requirements: Call or WhatsApp +0086 19859288691 for same-day quotation on critical spares.
- OEM / EPC Procurement: We support BOM-level sourcing for system integrators and engineering contractors — submit your full BOM for a consolidated quote.
- Export & Cross-Border: We ship internationally with full commercial invoice and packing list documentation for customs clearance.
Application-Specific FAQ
Q: Is the 1756-ESMCAP compatible with all ControlLogix controllers?
A: No. The 1756-ESMCAP is specifically designed for the 1756-L7x (Series B and later) ControlLogix controllers. It is not compatible with L6x or L8x series controllers. Verify your controller catalog number before ordering.
Q: How long does the capacitor provide backup power?
A: The ESM provides enough energy for the controller to complete a Non-Volatile Storage (NVS) save operation — typically a few seconds. It is not designed to keep the controller running indefinitely; it is designed to ensure a clean, data-safe shutdown.
Q: Does the 1756-ESMCAP replace the need for a UPS?
A: No. The ESM is a controller-level data protection device. A UPS (Uninterruptible Power Supply) is still recommended for applications requiring extended runtime during power outages. The ESM and UPS serve complementary roles.
Q: What is the difference between 1756-ESMCAP and 1756-ESMNSE?
A: The 1756-ESMCAP uses capacitor technology (maintenance-free, no replacement). The 1756-ESMNSE uses a non-rechargeable battery. The CAP variant is preferred for long-term installations where maintenance access is limited or battery disposal is a concern.
Q: Can I install the ESM while the controller is powered?
A: Rockwell Automation recommends following the installation procedure in Publication 1756-IN639. Always consult the official installation instructions and your site’s safety procedures before hot-swapping any ControlLogix component.
Q: Do you provide a warranty on this module?
A: Yes. Konmask.com provides a sourcing integrity guarantee. For manufacturer warranty terms, refer to Rockwell Automation’s standard warranty policy. Contact us at support@konmask.com for details specific to your order.
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