86466-60T RELIANCE

Reliance 110913-4R Memory Board, Dynamic

Brand：RELIANCE Model number：110913-4R

Country of origin: United States Product weight：0.55kg

HS code：9032899099

Product Details：

Product Dimensions：

A Reliance Electric Dynamic Memory Board, often found in their PLC (Programmable Logic Controller) or other control systems like the AutoMax series, served as a crucial component for expanding the program and data storage capabilities of these industrial controllers. "Dynamic" refers to Dynamic Random-Access Memory (DRAM), a type of memory that requires periodic refreshing to retain data, but offers a good balance of speed and cost for volatile storage.

Product Details

Function: The primary function of a Dynamic Memory Board is to provide additional volatile memory for the PLC or control system. This memory is used to store:

User Programs: The logic (ladder logic, control block, etc.) that defines the automation sequence.
Data Tables: Values for timers, counters, internal relays, process variables, and other operational data.
Configuration Settings: Parameters for I/O modules, communication settings, and system configurations.
Diagnostic Information: Temporary logs or status indicators.

Architecture: These boards would typically plug into a backplane or specific memory expansion slot within the Reliance Electric controller chassis (e.g., AutoMax rack). They would communicate directly with the processor unit of the PLC.
Types: While specific model numbers vary (e.g., 45C271, 57C413B), they generally differed in their memory capacity (e.g., 16K, 64K, 128K words/bytes). Some might have been designated as "Common Memory Modules" indicating shared memory access for certain system architectures.

Product Parameters

Memory Capacity: Measured in kilobytes (KB) or "words" (where a word could be 16 or 32 bits, depending on the processor architecture). Common capacities included 16K, 64K, 128K.
Memory Type: Dynamic RAM (DRAM). This implies it requires refresh cycles to maintain data and is volatile (data is lost upon power loss unless backed up by a battery or non-volatile memory).
Interface: Typically designed to plug into a proprietary backplane or bus of the Reliance Electric control system.
Power Consumption: Generally low, supplied by the controller's power supply.
Operating Temperature: Designed for industrial environments, typically -0°C to 60°C or similar ranges.
Physical Form Factor: A printed circuit board (PCB) assembly with connectors to mate with the system backplane, often with a faceplate for easy insertion/removal.
Compatibility: Specific to certain Reliance Electric PLC families or systems (e.g., AutoMax, AutoMate series).

Product Advantages (Historically)

Program and Data Expansion: Allowed users to implement larger and more complex control programs and manage more data points than the base controller memory permitted.
Cost-Effectiveness: Dynamic RAM was a cost-effective way to add volatile memory in the era these boards were prevalent.
Modular Design: Facilitated system configuration and upgrades by allowing users to add memory as needed.
Reliability: Built to industrial standards for robustness and long-term operation within a control system environment.

Important Considerations

Volatility: As DRAM, data on these boards is lost if power is removed from the module without battery backup or transfer to non-volatile memory. Proper battery backup systems within the PLC chassis are crucial for retaining programs and data during power outages.
Obsolescence: Reliance Electric is a legacy brand under Rockwell Automation. Finding new "Dynamic Memory Boards" can be difficult; spare parts often come from surplus markets or specialized industrial electronics suppliers. Support may be limited compared to current products.
Aging Components: Like all electronic components, older memory boards can experience aging-related failures (e.g., capacitor degradation, solder joint issues), leading to intermittent errors or complete failure.
Compatibility: Ensure the exact model of the memory board is compatible with the specific Reliance Electric PLC processor and chassis you are using.
Firmware/Software: Changes to memory configuration might require adjustments or re-downloads of the PLC's firmware or application program.

Common Issues and Troubleshooting Notes

Data Loss: Most common issue, typically due to failed battery backup in the PLC or power interruptions.
Module Not Detected: Could be due to improper seating, a damaged backplane slot, or a failed memory chip on the board itself.
System Faults: Memory errors often trigger system faults or diagnostic codes on the PLC, which can be interpreted using the controller's diagnostic manuals.
Intermittent Errors: May indicate aging components or environmental factors like temperature fluctuations or electrical noise.

Product Applications

Reliance Electric Dynamic Memory Boards were extensively used in various industrial automation and control applications where their PLCs were deployed, including:

Manufacturing: Machine control, assembly lines, material handling systems (conveyors, robotics).
Process Control: Batch processing, continuous flow control in chemical plants, food & beverage facilities, and pharmaceuticals.
Drives Control: Integrated into systems controlling variable speed drives for motors in various industrial machinery.
Power Generation and Distribution: Control systems for generators, switchgear, and energy management.
Water/Wastewater Treatment: Automation of pumping stations, filtration systems, and treatment processes.
Heavy Industry: Steel mills, paper mills, mining operations, where robust and reliable control was essential.

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