Product Short Description
Product Name: AutoMax / DCS 5000 Common Memory Module (64K)
Product Introduction: A common/shared memory module for Reliance Electric AutoMax and DCS 5000 distributed control systems. It provides a shared 64K RAM space for multi-processor configurations, allowing arbitration and data synchronization among multiple processor modules in a rack.
Description
Technical Specifications:
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Manufacturer: Reliance Electric (now part of Rockwell Automation / Baldor)
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Type: Common Memory Module
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System: AutoMax / DCS 5000
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Memory capacity: 64K words (expandable to 128K bytes including 64K registers)
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Memory type: Lithium-battery-backed RAM
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Battery-backed data retention: 600–2000 days with battery installed; 130–400 minutes after battery removal or depletion
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Backplane current load: 1.05 A @ 5 VDC
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Output frequency: 50 kHz (system clock reference)
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Operating voltage: 220 V (rack supply)
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Status indicators: Green “System Watchdog” LED; “Bat.OK” LED for battery voltage
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Typical installation slot: Slot 0 in multi-processor systems (or any even-numbered slot except power supply in single-processor systems; adjacent right slot must remain empty)
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Environmental: Complies with relevant international standards for industrial control
Functional Features:
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Provides a common memory space shared among multiple processors in a rack.
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Arbitrates bus access in multi-processor configurations.
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Stores I/O definitions and system configuration data.
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Lithium battery backup preserves data during power loss.
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Watchdog and battery-status LEDs for quick visual diagnostics.
Application Scenarios: Multi-processor AutoMax/DCS 5000 racks in metallurgy, paper, power and chemical industries where several processor modules need to share I/O and variable data.
Working Principle: The module plugs into the rack backplane and appears as a shared memory segment to all processors. It manages bus arbitration so that only one processor at a time can write to a given memory location, preventing conflicts. The lithium battery maintains RAM contents during power-down.
Installation Requirements:
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In a multi-processor system, install in slot 0 of the AutoMax/DCS 5000 rack.
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In a single-processor system, install in any even-numbered slot except where the power supply resides, leaving the immediately adjacent right-hand slot empty.
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Ensure the lithium battery is properly installed and charged.
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Connect to the rack backplane; no separate wiring required.
Usage Precautions:
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Monitor the “Bat.OK” LED regularly; replace the lithium battery before it fails to avoid data loss.
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When removing or replacing the battery, note that RAM data is retained for only 130–400 minutes.
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Do not install in odd-numbered slots in single-processor systems (the adjacent slot constraint must be observed).
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As a legacy/discontinued product, treat as a critical spare; verify battery health and LED function before deployment.
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