30735863-502 HONEYWELL

HONEYWELL 30735863-502 Memory Board, Dynamic

Brand：HONEYWELL Model number：30735863-502

Country of origin: United States Product weight：0.4kg

HS code：8517623990

Product Details：

Product Dimensions：

A Honeywell Dynamic Memory Board is a circuit card designed to be installed in a controller's chassis or rack. Its primary function is to serve as the system's working memory. As a dynamic memory board, it requires a continuous power supply and periodic refreshing to retain its data, which is typical for DRAM technology. It's a critical component that allows the controller to execute complex control logic, handle data from various input modules, and prepare data for output modules in real-time. Without this board, the controller cannot run its programmed tasks.

Functionality: Provides the main volatile memory for the controller's CPU, holding the operating system, the user program, and all runtime data (e.g., process values, timer counts, and internal flags).
Architecture: The board is populated with multiple DRAM chips and a memory controller circuit that manages data access and refreshing. It interfaces directly with the controller's backplane bus.
Purpose: The speed and capacity of this board directly impact the performance and complexity of the control application it can support.

Product Parameters

Specific parameters vary widely by the generation and model of the control system it was designed for. General parameters include:

Memory Capacity: Measured in kilobytes (KB) or megabytes (MB), often in ranges like 512KB, 1MB, or 4MB.
Memory Type: Dynamic Random Access Memory (DRAM).
Interface: Specific bus architecture compatible with the Honeywell control system's backplane (e.g., a proprietary bus for a TDC system).
Power Requirements: Draws power directly from the system's backplane (e.g., +5V DC).
Form Factor: A specific circuit board size with a unique edge connector for insertion into a designated slot.
Access Speed: The speed at which the CPU can read from and write to the memory, which is a key performance metric.
Part Number: A unique identifying number (e.g., MU-K-101) to ensure compatibility with a specific controller model.

Product Advantages

System Integration: As a proprietary component, it's designed for seamless and guaranteed compatibility with its intended Honeywell control system, ensuring stable operation.
Optimized Performance: The memory is optimized to work with the system's CPU and bus speed, providing a balanced performance for real-time control applications.
Reliability: Built to withstand the harsh conditions of an industrial environment, including wide temperature ranges and resistance to vibration and electrical noise.
Critical Function: It is the core memory component that enables the entire controller to function.

Important Considerations

Obsolescence: These boards are now considered obsolete. Finding new, factory-sealed parts is extremely difficult. The market consists primarily of refurbished or used components.
Compatibility: It is crucial to match the exact part number to the specific Honeywell controller model to ensure proper function and avoid damage.
Volatility: As DRAM, this memory is volatile. Any loss of power will erase its contents. The controller relies on separate non-volatile memory (e.g., EPROM or flash) to store the user program permanently.
Handling: Like all static-sensitive electronic components, it must be handled with care using proper electrostatic discharge (ESD) precautions to prevent damage.

Product Applications

The primary application for a Honeywell Dynamic Memory Board is to provide operational memory for legacy Honeywell industrial control systems. These systems were, and in some cases still are, used in a variety of industries.

Process Control: In chemical plants, refineries, and power generation facilities for real-time control and monitoring of critical processes.
Manufacturing: In large-scale manufacturing and assembly lines where a centralized controller is used to manage a complex series of operations.
Infrastructure: In water treatment facilities, pulp and paper mills, and other infrastructure projects.
Legacy System Maintenance: As a replacement part for existing systems that are still in operation, but which have a failed or degraded memory board.

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