086466-060W RELIANCE

Reliance 086466-060W Memory Board, Dynamic

Brand：RELIANCE Model number：086466-060W

Country of origin: United States Product weight：0.55kg

HS code：9032899099

Product Details：

Product Dimensions：

A "Dynamic Memory Board" from Reliance Electric (or any industrial control vendor) is a crucial component designed to expand the data storage and program execution capabilities of industrial controllers, primarily PLCs (Programmable Logic Controllers) and drive systems. These boards utilize Dynamic Random Access Memory (DRAM) technology, which offers a high density of storage at a relatively low cost, making them suitable for applications requiring significant memory for program logic, data tables, and historical logging.

Product Details

Core Function: The primary function of a dynamic memory board is to provide volatile memory for the controller. This memory is used to store:

User Programs: The logic created by engineers (e.g., ladder logic, function block diagrams) that dictates the operation of the industrial process.
Data Tables: Values from sensors, setpoints, control variables, and intermediate calculations.
Diagnostics and System Information: Data related to the controller's operation, errors, and status.
Recipe Data: Parameters for different product variations or operational modes.
Historical Data/Logging: In some cases, data can be temporarily buffered for logging before being sent to persistent storage.

Volatile Nature: Being DRAM, the data stored on these boards is volatile, meaning it is lost when power is removed. Industrial control systems that use such boards often incorporate battery backup units or non-volatile memory (like Flash or EEPROM) to retain critical program logic and data during power outages.
Integration: These boards are typically designed to plug directly into a backplane or specific slots within a Reliance Electric PLC chassis (e.g., AutoMax or AutoMate series). They communicate with the CPU module of the controller to provide rapid data access.
Form Factor: Usually a circuit board with memory chips, connectors for the backplane, and potentially small status LEDs.

Product Parameters (Typical for Historical Reliance Dynamic Memory Boards)

Memory Capacity:

Measured in kilobytes (KB) or megabytes (MB). Older boards might have capacities ranging from 64KB to a few MB (e.g., 64KB, 128KB, 256KB, 512KB, 1MB, 2MB, 4MB).

Memory Type:

Dynamic Random Access Memory (DRAM). Specific sub-types like FPM DRAM, EDO DRAM, or later SDRAM might have been used depending on the generation.

Bus Interface:

Designed to interface with the internal bus architecture of the specific Reliance Electric PLC family (e.g., Multibus-based for AutoMax).

Power Consumption:

Relatively low, but specific values would depend on the board design and memory chips used.

Operating Voltage:

Typically supplied by the PLC backplane power supply (e.g., 5V DC).

Access Speed:

Measured in nanoseconds (ns) for memory access times, contributing to the overall scan time of the PLC.

Temperature Range:

Industrial grade, typically 0°C to 60°C or broader, to suit factory environments.

Product Advantages

Cost-Effectiveness (Historically): DRAM offered a high memory density at a lower cost per bit compared to Static RAM (SRAM) at the time of its widespread use.
High Density: Allows for the storage of larger programs and more extensive data sets within the controller.
Speed: Provides relatively fast read/write access speeds for the controller's CPU, crucial for real-time control applications.
Scalability: Allows users to expand the memory capacity of their PLC systems as application complexity grows.
Standard Component: Utilizes a widely adopted memory technology, benefiting from advancements in the broader electronics industry.

Important Considerations

Volatile Memory: The primary drawback of DRAM. Data is lost upon power loss. This necessitates:

Battery Backup: Most industrial controllers using DRAM memory boards have a battery on the CPU module or backplane to maintain the memory contents during power outages.
Non-Volatile Storage: Programs and critical data are typically backed up to non-volatile memory (e.g., Flash, EEPROM cards) or programming devices to allow restoration after a prolonged power loss or battery failure.

Refresh Cycles: DRAM requires constant "refresh" cycles to maintain its data charge. This process is handled by the memory controller on the CPU or the memory board itself and can introduce minor overhead.
Aging Hardware: As these are legacy products, finding new, factory-sealed Reliance Electric Dynamic Memory Boards is increasingly difficult. Replacements often come from secondary markets or refurbished sources, which may have reduced lifespans.
Compatibility: Ensure the correct memory board part number and revision are used for the specific Reliance Electric PLC CPU and chassis to ensure compatibility.
Static Sensitivity: Like all electronic circuit boards, they are sensitive to electrostatic discharge (ESD) and require careful handling.

Product Applications

Reliance Electric Dynamic Memory Boards were primarily used in industrial automation applications that relied on Reliance Electric's PLC and drive platforms. These applications include:

Manufacturing and Process Control:

Automated assembly lines, machine control, batch processing in chemical, food, and pharmaceutical industries.
Control of conveyors, robotic cells, and material handling systems.

Continuous Processes:

Monitoring and control in steel mills, paper mills, and power generation facilities, where large amounts of historical data or complex control loops might be required.

Pulp and Paper Industry:

Control of paper machines, stock preparation, and finishing lines.

Automotive Manufacturing:

Used in various stages of vehicle assembly, paint shops, and body shops.

Water and Wastewater Treatment:

Controlling pumps, valves, and filtration systems, often requiring memory for historical trend data.

Mining and Metals:

Control of heavy machinery, material processing, and environmental monitoring.

803624-74C RELIANCE

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