86466-76R RELIANCE

Reliance 86466-76R Central unit

Brand：RELIANCE Model number：86466-76R

Country of origin: United States Product weight：0.55kg

HS code：9032899099

Product Details：

Product Dimensions：

A "Central Unit" in the context of Reliance Electric's industrial automation product line typically refers to the main processor or CPU module of a Programmable Logic Controller (PLC) system. These units are the "brain" of the automation system, executing the user program (ladder logic, function block diagram, etc.), managing I/O, and facilitating communication.

Product Details

Functionality:

The Central Unit executes the control program, making decisions based on inputs from field devices and generating outputs to control actuators.
It manages data flow between I/O modules, communication modules, and other system components.
It typically contains the processor, memory for the program and data, and various communication ports.

Architecture:

Reliance Electric's central units were often part of a modular PLC system (e.g., AutoMate, AutoMax series). This means the central unit would plug into a backplane or rack, alongside power supplies and I/O modules.
Some systems might have supported distributed control, where multiple central units or remote I/O heads could communicate over an industrial network.

Programming:

Programmed using specialized software on a personal computer, typically utilizing ladder logic, but some advanced systems might have supported other languages like BASIC or control blocks.

Key Features (historical context):

High-speed processing for real-time control.
Retentive memory for data retention during power loss.
Diagnostic indicators for status and troubleshooting.
Host computer interface capability for SCADA/HMI integration.
Rugged industrial packaging for harsh environments.

Product Parameters (Typical, varies by specific model/series)

Processor Type: Often utilized microprocessors (e.g., Intel 801 in older AutoMate models).
Memory Size:

Program memory: Ranging from a few kilobytes (e.g., 1K x 16 non-volatile memory for AutoMate 15) to larger sizes (e.g., 2K x 16 non-volatile memory for AutoMate 20).
Data registers: Number of internal coils and registers (e.g., 64 Internal Coils, 56 Registers for AutoMate 15; 736 Internal Coils, 512 Registers for AutoMate 20).

Execution Speed: Measured in milliseconds per K ladder element (e.g., 4 ms/K for AutoMate 15, 10 ms/K for AutoMate 20).
I/O Capacity: The maximum number of digital/analog I/O points the central unit could address (e.g., AutoMate 20 could address up to 256 digital or 64 analog I/O).
Communication Ports: Typically serial ports (e.g., RS-232, RS-485) for programming and host communication, potentially supporting proprietary industrial networks (e.g., R-NET Industrial Network).
Power Supply: Usually derived from a dedicated power supply module within the same rack.
Operating Temperature: Designed for typical industrial environments, often in the range of 0°C to 60°C.

Product Advantages

Reliability: Reliance Electric products were known for their robust design and long-term reliability in industrial settings.
Control Performance: Provided dedicated processing for deterministic real-time control of industrial processes.
Modularity: The modular nature allowed for flexible system sizing and easy replacement of components.
Diagnostic Capabilities: Built-in diagnostics aided in troubleshooting and system maintenance.
Integration with HMI/SCADA: Designed to interface with Human-Machine Interface (HMI) and Supervisory Control and Data Acquisition (SCADA) systems for visualization and data logging.

Important Considerations

Obsolete Status: It's critical to note that Reliance Electric's PLC product lines (like AutoMate and AutoMax) were discontinued by Rockwell Automation around 2005-2009. While parts might still be available from third-party suppliers, they are considered obsolete.
Support and Spares: Long-term support and availability of spare parts for these legacy systems can be challenging.
Modernization: For new projects or system upgrades, modern PLC/PAC platforms from Rockwell Automation (Allen-Bradley) or other current manufacturers would be recommended, as they offer significantly enhanced features, performance, and cybersecurity.
Programming Software: Finding compatible and supported programming software for very old Reliance Electric PLCs can be difficult.

Product Applications (Historical and Legacy Systems)

Reliance Electric Central Units were widely applied in various industrial sectors where automated control was required. Their applications included:

Manufacturing: Machine control, assembly lines, material handling, packaging.
Process Control: Chemical processing, food and beverage production, pharmaceuticals, where precise control of continuous processes was needed.
Metals Industry: Rolling mills, furnaces, and other heavy industrial applications.
Pulp and Paper: Control of paper machines and associated processes.
Power Generation: Balance of plant control in power facilities.
Water and Wastewater Treatment: Control of pumps, valves, and treatment processes.

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