The Allen-Bradley 1757-BEM, also cataloged as the 1757BEM Battery Extension Module, operates as a dedicated hardware component for providing backup battery power retention within ProcessLogix control platforms.

Model Reference

The 1757-BEM is a battery extension module designed to maintain backup power for ProcessLogix controller memory retention circuits. The module provides a 3 VDC backup supply path and supports standby current requirements for controller data preservation during primary power interruption.

Hardware Specifications

ProcessLogix Platform Compatibility

The 1757-BEM operates as a dedicated backup power accessory within the ProcessLogix control architecture. The module maintains stored controller information by supplying backup voltage when the primary operating power source is unavailable.

The module requires correct installation within the compatible ProcessLogix hardware configuration. Power connections, battery condition, and controller status indicators should be verified during commissioning and maintenance procedures.

Firmware and Control System Integration

Allen-Bradley ProcessLogix hardware uses defined module identification and communication parameters for system configuration. The 1757-BEM does not perform control logic execution but provides electrical backup support for associated controller memory retention functions.

System compatibility requires matching hardware revision requirements and ProcessLogix configuration parameters before replacement or installation.

Ordering Info

• 1 x Allen-Bradley 1757-BEM Battery Extension Module
• 1 x Battery extension module assembly
• 1 x Product identification label
• ProcessLogix controller hardware, chassis, and external accessories are not included unless separately specified

Field Installation Guidelines

Power Connection

• Verify the 24 VDC supply polarity before connecting the module.
• Confirm the ProcessLogix system power state before installation or replacement.
• Avoid connecting the module to unsupported voltage sources.

Battery Handling

• Inspect battery condition before commissioning.
• Replace the module according to maintenance requirements when backup capacity decreases.
• Prevent short circuits across battery terminals during handling.

Installation Environment

• Install the module in a clean and dry control cabinet environment.
• Maintain separation between low-level control wiring and high-voltage power conductors.
• Verify connector engagement and mechanical mounting before system startup.

Frequently Asked Questions

• What is the primary function of the 1757-BEM?

  The 1757-BEM provides backup battery power extension for ProcessLogix systems to maintain memory retention functions during loss of primary power.

• What voltage does the battery backup provide?

  The module provides a 3 VDC backup voltage output for the supported ProcessLogix backup circuit.

• What is the operating supply voltage of the module?

  The 1757-BEM operates from a 24 VDC supply input within the ProcessLogix hardware configuration.

• What is the maximum power consumption of the module?

  The maximum power consumption is specified as 0.5 W during operation.

• What is the standby current consumption?

  The standby current draw is specified as less than 10 uA for backup monitoring conditions.

• How long can the battery maintain backup operation?

  The module specification indicates up to 240 hours of full-charge backup capability under rated conditions.

• What is the expected battery service life?

  The specified battery life range is 5 to 10 years depending on operating conditions and system usage.

• Does the 1757-BEM execute control logic?

  No. The module provides battery backup power support and does not execute controller application programs.