SGDC-15DSA Yokogawa

SGDC-15DSA Yokogawa Memory Board, Dynamic

Product  Description：

Yokogawa Dynamic Memory Boards are high-capacity, volatile memory expansion modules designed for the CENTUM series Distributed Control System (DCS) processors and high-performance field control stations. These boards utilize Dynamic RAM (DRAM) technology to provide the fast read and write speeds required for large-scale industrial data processing. They act as the primary workspace for the controller's operating system, temporary process variables, real-time trend buffers, and active control algorithms, ensuring that complex mathematical computations are executed without latency.

Product Parameters

The technical profile of a Yokogawa Dynamic Memory Board is optimized for stability, capacity, and high-frequency data refresh rates:

• Memory Architecture: Utilizes high-density Dynamic Random Access Memory (DRAM) with built-in Error-Correcting Code (ECC) functionality to detect and correct single-bit memory errors in real time.

• Storage Capacity: Available in various industrial-grade capacities tailored to specific processor generations, ranging from legacy megabyte configurations to modern gigabyte expansion modules.

• Data Access Speed: Low-latency bus access times engineered to match the clock cycle of Yokogawa proprietary control processors, preventing CPU wait states.

• Power Consumption: Low-power consumption architecture drawing power directly from the processor mainboard bus, optimized to minimize heat generation.

• Refresh Cycle: Automatically managed high-frequency dynamic refresh cycles, hidden from the main CPU operations to maintain deterministic processing loops.

• Isolation and Shielding: Multi-layer PCB design featuring internal ground planes to shield the high-speed data lines from external electromagnetic interference.

Product Advantages

Yokogawa Dynamic Memory Boards offer critical technical benefits for processing-intensive automation environments:

• Error-Correcting Code (ECC) Reliability: The integrated ECC technology prevents system crashes or operational corruption caused by soft errors or cosmic ray bit-flips, which is crucial for maintaining continuous plant operations.

• High-Speed Data Buffering: Enables the controller to capture and store high-frequency process trends and alarms locally before transmitting them to the Human Interface Station (HIS), preventing data loss during network congestion.

• Seamless OS Integration: Fully recognized by Yokogawa real-time operating systems out of the box, requiring no manual partition configuration or memory allocation scripts.

• Industrial Longevity: Built with premium silicon components rated for 24/7 continuous operation under high thermal stress, far exceeding the lifespan of standard commercial memory modules.

• Preserved Processing Determinism: The high-speed parallel bus architecture ensures that memory access times remain constant, allowing the controller to execute safety-critical logic loops within strict millisecond deadlines.

Product Applications

These memory boards are installed where extensive data handling and complex control strategies are required:

• Large-Scale Recipe Management: Storing complex batch processing parameters and multi-step execution logic in pharmaceutical and specialty chemical plants.

• Advanced Process Control (APC): Executing real-time multivariable predictive control algorithms that require heavy matrix calculations and historical data processing directly on the controller.

• High-Density Alarm Logging: Managing thousands of sequence-of-events (SOE) data points concurrently in large oil refineries and power generation plants.

• Complex Continuous Simulations: Running internal model control (IMC) logic where the processor continuously simulates process behavior to adjust control outputs accurately.

• Network Data Bridging: Serving as a high-speed data buffer for communication cards that manage massive amounts of data flowing from fieldbus networks to the central DCS core.

Important Precautions

To avoid hardware damage or catastrophic loss of control data, technicians must observe the following rules:

• Volatility and Backup: Because this is dynamic memory, all data is lost when power is removed. Ensure that the controller's battery-backed non-volatile memory (NVRAM) or flash memory contains the permanent copy of the control database before restarting the station.

• Electrostatic Discharge (ESD) Danger: DRAM chips are highly sensitive to static electricity. Always handle the board by its edges while wearing a properly grounded ESD wrist strap, and store it in an anti-static bag when not installed.

• Power-Off Installation: Never insert or remove the memory board while the processor unit is powered on. Doing so will cause electrical short circuits that can permanently destroy both the memory module and the main CPU board.

• Alignment and Pin Protection: Carefully align the multi-pin connector with the motherboard slot before applying gentle, even pressure. Forcing the board into the slot at an angle can bend the high-density pins and ruin the backplane connection.

• Thermal Awareness: Ensure the processor cabinet cooling fans are operational. High ambient temperatures can increase the failure rate of dynamic memory cells and lead to premature component aging or frequent ECC errors.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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