Application ScenariosIn a continuous process plant such as a chemical reactor or a pharmaceutical batch process, an unexpected power glitch can result in the loss of critical recipe data, setpoints, and real-time diagnostics. The 1757-BEM is installed within the ProcessLogix rack to provide autonomous backup power. When a power outage occurs, the module instantly takes over, preserving the controller’s memory and keeping essential I/O states active. This allows the system to resume operation seamlessly once power is restored, without requiring manual re-initialization or risking the production of an off-spec batch. Its role is critical in preventing unplanned downtime and maintaining process consistency.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1757-BEM |
| Manufacturer | Allen‑Bradley (Rockwell Automation) |
| Product Category | Battery Extension Module (Memory Backup Power Supply) |
| Compatible System | ProcessLogix DCS / Rack |
| Nominal Voltage | 3 V DC (Lithium-based) |
| Backup Current | ~5 mA @ 3.6 V (typical for memory retention) |
| Backup Duration | Up to 240 hours (10 days) on full charge |
| Operating Temp. | 0 °C to 60 °C (32 °F to 140 °F) |
| Storage Temp. | -20 °C to 85 °C (-4 °F to 185 °F) |
| Battery Life | 5–7 years (typical service life) |
| Mounting | Chassis slot mount (within ProcessLogix rack) |
| Status Indication | LED indicators for charge/health status |
| Replacement | User-replaceable battery cartridge |
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