0-51879-1 RELIANCE

Reliance 0-51879-1 Communication Processor

Brand：RELIANCE Model number：0-51879-1

Country of origin: United States Product weight：0.55kg

HS code：9032899099

Product Details：

Product Dimensions：

Reliance Electric Communication Processors were specialized modules designed to facilitate data exchange and network connectivity within industrial control systems, particularly for their AutoMax and Automate series PLCs and drive systems. Their primary role was to enable controllers to communicate with each other, with human-machine interfaces (HMIs), supervisory control and data acquisition (SCADA) systems, and other intelligent devices across various industrial networks.

Product Details

Core Function: These modules acted as dedicated communication interfaces, offloading network processing from the main CPU of the PLC. This allowed the PLC to focus on its primary control tasks while the communication processor handled the complexities of network protocols, data buffering, and message routing.
Architectural Integration: They typically integrated into the PLC's backplane or a dedicated communication rack, drawing power and communicating with the CPU via the backplane bus.
Supported Networks: Historically, Reliance Electric developed its own proprietary industrial networks, such as R-NET, which offered high-speed, deterministic communication for real-time control applications. They also supported common industrial protocols of their time.
Features:

Multiple Communication Ports: Often featured various ports (e.g., RS-232C, RS-485, network interfaces) for connecting to different devices and networks.
Protocol Conversion: Some advanced modules could perform protocol conversion, allowing devices using different protocols to communicate.
Data Buffering: Stored incoming and outgoing data temporarily to manage traffic and ensure data integrity.
Diagnostic Capabilities: Included LEDs and diagnostic ports (e.g., RS-232C for internal diagnostics) to help troubleshoot network issues.
Real-time Responsiveness: Designed for industrial environments where timely data exchange is crucial for synchronized operations.

Product Parameters (Typical for Legacy Modules)

Given that these are legacy products, specific parameters can vary widely by model. Here are typical examples:

Voltage: Often 24V DC (drawn from the backplane).
Current Consumption: Varies by module, e.g., around 0.5A.
Communication Speed: For proprietary networks like R-NET, speeds could be high for their time, e.g., 845K baud rate. For serial ports, standard baud rates (e.g., 9600, 19200 bps) would apply.
Network Length: Could support distributed network lengths, e.g., up to 3000 ft for R-NET.
Microprocessor: Early modules might have used 16-bit or 32-bit microprocessors (e.g., Motorola 68000 series).
Memory: Onboard memory for program storage, buffering, and configuration.
Operating Temperature: Robust industrial temperature range, typically -20°C to 70°C.
Physical Form Factor: PC board modules designed for rack or chassis mounting.

Product Advantages (Historical Context)

Dedicated Performance: By offloading communication tasks, these processors freed up the main PLC CPU, improving overall system performance and control loop execution time.
Network Integration: Enabled seamless connectivity between various Reliance Electric control components, forming a unified automation system.
Distributed Control: Supported distributed control architectures, allowing control to be spread across multiple PLCs and I/O points while maintaining synchronized operation.
Reliability: Built for the harsh conditions of industrial environments, offering high reliability and long operational life.
Proprietary Network Benefits (e.g., R-NET): Offered deterministic and high-speed communication crucial for demanding industrial applications that required tight synchronization.

Important Considerations

Legacy Status: New Reliance Electric branded communication processors are generally not manufactured. Support for these legacy systems is primarily through Rockwell Automation's lifecycle services, third-party repair providers, or the second-hand market.
Protocol Support: While they supported various protocols, modern industrial communication largely relies on Ethernet-based protocols (e.g., EtherNet/IP, PROFINET, Modbus TCP). Integrating legacy Reliance systems with modern networks may require gateways or protocol converters.
Software Compatibility: Programming and configuration of these modules require specific Reliance Electric or older Rockwell Automation software tools that may run on older operating systems.
Maintenance and Spares: Sourcing replacement parts or finding experienced technicians for these legacy systems can be challenging.
Migration Planning: For critical applications, planning for migration to modern Rockwell Automation (Allen-Bradley) or other contemporary control platforms is often recommended.

803456-4T RELIANCE

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