Allen-Bradley 1757-BEM ProcessLogix Battery Extension Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1757-BEM is a dedicated Battery Extension Module designed for the Rockwell Automation ProcessLogix distributed control system (DCS). It extends battery backup capacity to the ProcessLogix controller chassis, ensuring memory retention and safe shutdown during power interruptions in continuous-process industrial environments.
Buyers searching for a 1757-BEM replacement or a ProcessLogix battery module equivalent must carefully evaluate electrical compatibility, connector pinout, and firmware revision before substituting any component. This guide consolidates the critical selection criteria, compatible alternatives, and sourcing assurance information to support confident procurement decisions.
Technical Specifications
- Part Number: 1757-BEM
- Manufacturer: Allen-Bradley / Rockwell Automation
- Series: ProcessLogix DCS
- Function: Battery Extension Module – extends backup battery runtime for controller memory retention
- Nominal Voltage: 3.6 V lithium battery circuit
- Connector Interface: Proprietary ProcessLogix backplane connector (key parameter for replacement decisions)
- Mounting: DIN-rail / chassis slot mount within 1757-series chassis
- Operating Temperature: 0 °C to +60 °C
- Storage Temperature: –40 °C to +85 °C
- Humidity: 5–95% RH, non-condensing
- Certifications: CE, UL Listed, cUL
- Weight: Approx. 200 g
- Country of Origin: USA
- ⚠ Key replacement parameters: connector pinout, voltage rating, and chassis slot compatibility must match exactly.
Compatible Replacement & Equivalent Models
1. Direct Drop-in Replacements
- 1757-BEM (new production run) – Identical OEM part; recommended for mission-critical systems. Verify firmware revision matches existing chassis.
- 1757-BEM /A, /B revisions – Earlier hardware revisions; functionally identical in most ProcessLogix configurations. Confirm revision compatibility with your system integrator.
2. Functional Equivalents
- 1757-BEMX (if released by Rockwell) – Extended-capacity variant; check Rockwell product bulletin for backward compatibility with existing 1757-series chassis before substituting.
- OEM-refurbished 1757-BEM – Factory-refurbished units with tested battery cells; suitable for non-critical backup applications. Require certificate of refurbishment.
3. Cross-Brand Alternatives
- Honeywell / Experion PKS battery backup modules – Functionally similar role in competing DCS platforms; not electrically interchangeable with 1757-BEM. Applicable only if migrating away from ProcessLogix.
- Siemens SIMATIC S7 battery modules (e.g., 6ES7 971-series) – Cross-brand substitute for S7-300/400 platforms only; incompatible with ProcessLogix chassis. Cited here for cross-brand search context.
- ⚠ Cross-brand alternatives require full system re-engineering. Contact Konmask for migration consultation.
Why Choose the Original 1757-BEM Model
- Precision-matched voltage & capacity: Factory-calibrated to ProcessLogix controller memory retention requirements; no derating or runtime uncertainty.
- OEM certifications intact: CE and UL listings apply only to the original 1757-BEM; third-party substitutes may void system certification.
- Backplane connector compatibility: Proprietary connector geometry ensures zero-risk mechanical fit; aftermarket connectors risk intermittent contact faults.
- Rockwell Automation firmware alignment: Original modules are validated against all ProcessLogix firmware revisions; substitutes may trigger diagnostic faults.
- Full technical support: Rockwell Automation and Konmask provide application engineering support exclusively for OEM parts.
- Warranty & traceability: Each unit ships with full traceability documentation; critical for regulated industries (pharma, oil & gas, power generation).
Typical Applications
- Oil & Gas: Upstream/downstream DCS controllers requiring uninterrupted memory backup during power transients at remote wellhead or refinery sites.
- Chemical Processing: Continuous-batch reactor control systems where controller memory loss causes costly batch failures or safety incidents.
- Power Generation: Turbine and boiler management systems using ProcessLogix DCS with stringent uptime SLAs.
- Pharmaceuticals: FDA-regulated manufacturing lines where validated control system configurations must be preserved across power events.
- Pulp & Paper: High-humidity mill environments requiring reliable battery backup for process continuity.
- Water & Wastewater: Municipal treatment plant SCADA/DCS nodes where power interruptions are frequent and memory retention is mandatory.
System Compatibility
- 1757-PLX52 / PLX72 ProcessLogix Controllers – Primary host controllers; 1757-BEM installs in adjacent chassis slot.
- 1757-SRM (System Redundancy Module) – Redundant controller pairs; each controller chassis requires its own 1757-BEM.
- 1757-FFLD (Foundation Fieldbus Linking Device) – Field device interface; shares chassis with controller; battery module protects all resident modules.
- 1757-SWKIT ProcessLogix Software Suite – Configuration and diagnostics software; battery status visible via system health dashboard.
- 1757-CHS (ProcessLogix Chassis) – Physical mounting chassis; 1757-BEM occupies one dedicated slot.
- Rockwell FactoryTalk AssetCentre – Asset management platform; logs battery module health events for predictive maintenance.
Selection Guide
Answer these three questions before ordering to confirm the 1757-BEM is the right fit for your application:
- Is your DCS platform the Rockwell Automation ProcessLogix 1757-series? If yes, the 1757-BEM is the correct OEM battery extension module. If you operate a ControlLogix, CompactLogix, or third-party DCS, contact Konmask for the correct part number.
- Does your chassis have an available battery module slot? Verify slot availability in your 1757-CHS chassis layout. If the slot is occupied by a different module, a chassis expansion may be required.
- What is your required backup duration? The standard 1757-BEM provides defined runtime per Rockwell specifications. If extended backup is required, ask Konmask about extended-capacity options or external UPS integration.
Not sure? Contact Konmask at support@konmask.com or +0086 19859288691 — our engineers respond within 24 hours.
Quality Assurance & Sourcing
All 1757-BEM units supplied by Konmask are sourced through authorized distribution channels and verified secondary-market suppliers with full chain-of-custody documentation.
4-Step Inspection Process:
- Visual & mechanical inspection – Connector integrity, housing condition, label authenticity check against Rockwell hologram standards.
- Electrical verification – Battery voltage and internal resistance measured against OEM specification tolerances.
- Functional test – Module installed in test chassis; backup activation and runtime verified.
- Documentation package – Inspection report, serial number log, and test data sheet compiled before shipment.
Available documentation: Certificate of Conformance, Test Report, Material Traceability Record, Commercial Invoice with HS Code.
How to Order
- Submit your inquiry – Email support@konmask.com with part number (1757-BEM), required quantity, and any revision or date-code preferences.
- Receive quote & availability confirmation – Konmask responds within 24 hours with pricing, lead time, and documentation list.
- Confirm & ship – Upon order confirmation, units are inspected, packaged, and dispatched with full documentation. Express and standard shipping options available worldwide.
Replacement & Compatibility FAQ
Q1: Can I use a third-party battery module as a direct replacement for the 1757-BEM?
A: Third-party modules are not recommended as direct substitutes. The 1757-BEM uses a proprietary backplane connector and is firmware-validated for ProcessLogix controllers. An incompatible replacement may cause diagnostic faults, void OEM certifications, or fail to provide adequate memory backup. Konmask recommends sourcing the original OEM part or a certified refurbished equivalent.
Q2: Is the 1757-BEM compatible with both redundant and non-redundant ProcessLogix configurations?
A: Yes. The 1757-BEM is compatible with both simplex and redundant (1757-SRM) ProcessLogix controller configurations. In redundant setups, each controller chassis requires its own dedicated 1757-BEM — they are not shared between primary and secondary controllers.
Q3: What is the functional equivalent of the 1757-BEM if I am migrating from ProcessLogix to a newer Rockwell platform?
A: If migrating to Rockwell ControlLogix or PlantPAx, the battery backup function is handled differently — typically via the 1756-BATT (ControlLogix battery) or an integrated UPS solution. These are not drop-in substitutes for the 1757-BEM but serve an equivalent functional role on the new platform. Contact Konmask for a migration-specific selection consultation.
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