XFR824-A HONEYWELL

HONEYWELL XFR824-A Memory Board, Dynamic

Brand：HONEYWELL Model number：XFR824-A

Country of origin: United States Product weight：0.4kg

HS code：8517623990

Product Details：

Product Dimensions：

A Honeywell Dynamic Memory Board is a specialized circuit board designed for use within older industrial control systems, particularly in distributed control systems (DCS) and industrial computers. Its primary purpose is to provide the main volatile memory (RAM) necessary for the controller's processor to execute its real-time operating system and run control applications. The term "dynamic" refers to the type of RAM used, which requires a constant refresh cycle to retain stored data, in contrast to static RAM. These boards were a core component in legacy Honeywell systems, and their function was critical for the performance and stability of the entire control process.

Functionality: The board provides the main working memory for the control system's central processing unit (CPU). The CPU uses this memory to store program instructions, temporary data, and the real-time values of all process variables (e.g., temperatures, pressures, valve positions). Without a working memory board, the system cannot operate.
Design: These boards are proprietary to specific Honeywell control platforms. They are designed as a plug-in module that fits into a dedicated slot on the system's backplane or chassis. The design includes memory chips (DRAM), a memory controller, and other logic to interface with the system bus.

Product Parameters

Specific parameters for these legacy boards can vary, but here are general characteristics you would find:

Memory Capacity: Measured in kilobytes (KB) or megabytes (MB). For older systems, this could be as low as 128KB or up to a few megabytes.
Memory Type: Dynamic Random-Access Memory (DRAM).
Access Time: The speed at which data can be read from or written to the memory, often in nanoseconds (ns).
Data Bus Width: The number of data lines used to transfer information between the memory and the CPU (e.g., 8-bit, 16-bit, 32-bit).
Operating Voltage: Typically 5V DC, supplied from the system's backplane.
Form Factor: A specific, proprietary board size and connector keyed for a particular Honeywell chassis.
Operating Temperature: Engineered for industrial environments, with a range typically between 0°C to 60°C.

Product Advantages

Integration: Designed for seamless, plug-and-play integration with specific Honeywell control system platforms, ensuring full compatibility.
Reliability: Built to industrial standards to withstand the harsh conditions found in process plants, including temperature fluctuations and vibrations.
Performance: Provides the necessary high-speed memory access for the processor to execute control algorithms and respond to process changes in real time.
System Foundation: As a core component, it is essential for the entire control system to function. A working, reliable memory board is a fundamental advantage for maintaining an operational legacy system.

Important Considerations

Obsolescence: Honeywell Dynamic Memory Boards are considered legacy or obsolete products. Sourcing replacements can be extremely difficult, often requiring a search of the used or surplus parts market.
Compatibility: The boards are highly proprietary and not interchangeable between different Honeywell systems or with third-party components. You must match the specific part number to the correct control system model.
Failure Mode: Like all electronic components, DRAM can fail over time, often due to aging or heat. A memory board failure can lead to a complete system crash, loss of control, and process shutdown.
Electrostatic Discharge (ESD): These boards are highly sensitive to static electricity. Proper grounding and handling procedures are essential during installation and maintenance to prevent damage.
Battery Backup: Some systems may use a small battery on the main processor board to maintain data in other types of memory, but the dynamic memory itself requires constant power from the system to retain data.

Product Applications

Honeywell Dynamic Memory Boards are almost exclusively used in legacy Honeywell control systems within various industrial sectors.

Distributed Control Systems (DCS): They are a core component in the controllers for systems like the TDC 2000 and TDC 3000, which are still in operation in many plants worldwide.
Process Industries: Found in oil and gas refineries, chemical plants, power generation facilities, pulp and paper mills, and pharmaceutical plants where older Honeywell DCS systems are still used for process automation and monitoring.
Manufacturing: In some cases, they are used in large-scale manufacturing operations that rely on older, established Honeywell industrial computers or controllers.

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