GE IC693BEM331D
GE IC693BEM331D - Image 2

GE IC693BEM331D

  • Product Introduction: This is a battery backup module for the GE Fanuc 90-30 PLC platform. The “BEM” designation stands for Battery Backup Module. It provides uninterruptible power to the PLC’s RAM memory and real-time clock when main power is lost, ensuring that program data, retentive memory values, and time-of-day clock information are preserved during power outages. The “331” indicates it supports the Series 90-30 CPUs, and the “D” suffix denotes a specific hardware revision. This module is essential in applications where program loss or data corruption during a power failure would cause safety issues, production losses, or process upsets.
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Category: SKU: GE IC693BEM331D

Description

 GE IC693BEM331D

  • Technical Specifications:
    • Type: Battery backup module for 90-30 PLC
    • Battery Type: 3.6V lithium battery (ER17505 or equivalent)
    • Battery Life: 5 years typical (at 25°C ambient)
    • Backup Duration: Maintains RAM and clock for up to 200 hours without main power (depending on CPU model and memory size)
    • Charging Current: 15mA typical from backplane
    • Power Consumption: Approximately 0.5W (quiescent)
    • Operating Temperature: 0°C to 60°C
    • Dimensions: Standard IC693 module form factor
  • Functional Features:
    • Automatically switches to battery power when main power fails
    • Maintains all retentive memory and program data in RAM
    • Preserves real-time clock and time-stamped data
    • LED indicator shows battery status (charging, OK, low, failed)
    • Backplane-powered for charging
    • Hot-swappable battery in some configurations
    • Compatible with all 90-30 CPUs (IC693CPU3xx, IC693CPU7xx series)
  • Application Scenarios:
    • Process control systems where power loss causes hazardous conditions
    • Water and wastewater treatment plants
    • Oil and gas pipeline monitoring
    • Chemical process control
    • Any application requiring data retention across power cycles
    • Systems with time-stamped event logging
  • Performance Parameters:
    • Battery Voltage: 3.6V nominal
    • RAM Retention Time: Up to 200 hours (varies by CPU memory size)
    • Clock Accuracy: Plus or minus 1 minute per month (on internal clock)
    • Switchover Time: Less than 1 millisecond (seamless transition)
    • Bus Speed: Genius Bus, 10Mbps
    • MTBF: Greater than 200,000 hours
  • Material Composition:
    • Housing: UL94 V-0 ABS plastic
    • PCB: 4-layer FR-4, conformally coated
    • Battery Holder: Nickel-plated steel contacts for secure battery retention
    • Connectors: Gold-plated backplane edge connector
    • LEDs: Red (low battery), green (OK), amber (charging)
  • Structural Features:
    • Standard IC693 module width
    • 3 LED status indicators on front panel (charging, OK, low battery)
    • Battery compartment accessible from front of module (no tools required for battery replacement)
    • DIN-rail or chassis mountable
    • Keying notch for correct orientation
  • Working Principle:
    • The module is continuously charged by the PLC backplane when main power is present. The internal circuitry monitors the battery voltage and main power status. When main power fails, a MOSFET switch instantly (within 1ms) connects the battery to the CPU’s RAM and clock circuit, preventing any data loss. The battery supplies only the low-current retention circuit (typically 10-20mA), allowing it to last for years. When main power returns, the module automatically recharges the battery and switches back to main power.
  • Installation Requirements:
    • Mount in IC693 or IC695 chassis adjacent to the CPU (recommended within 2 slots)
    • Insert the lithium battery before powering up the PLC
    • Verify battery is seated correctly — the module will not function without a battery installed
    • Replace battery every 5 years or when the low-battery LED illuminates
    • Do not mix battery types — use only the specified 3.6V lithium cell
  • Usage Precautions:
    • Replace the battery before it fully depletes — the low-battery LED gives approximately 30 days warning
    • Do not use rechargeable batteries — use only the specified primary lithium cell
    • Do not dispose of lithium batteries in regular trash — follow local hazardous waste regulations
    • Verify battery status LED is green (OK) before relying on backup function
    • In safety-critical applications, test the battery backup function periodically by simulating a power loss

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