802420-2T RELIANCE

Reliance 802420-2T Communication Interface

Brand：RELIANCE Model number：802420-2T

Country of origin: United States Product weight：0.55kg

HS code：9032899099

Product Details：

Product Dimensions：

Reliance Electric Communication Interface Modules were essential components designed to enable communication between Reliance Electric's control systems (such as the AutoMax PLC series) and other devices, networks, or host computers. These modules facilitated data exchange, remote control, and system integration in various industrial automation applications.

Product Details

Functionality:

Enabling peer-to-peer communication between PLCs.
Facilitating data exchange with SCADA systems, HMIs, and other supervisory control devices.
Allowing remote I/O connectivity.
Providing diagnostic information and status monitoring for the communication link.
These modules served as gateways, translators, or direct links, allowing Reliance Electric PLCs and other control hardware to exchange data with external systems.
They typically supported various industrial communication protocols to connect to different types of devices or networks.
Common functions included:

Types (Examples based on known modules):

Modbus Interface Modules: To interface with Modicon Modbus and Modbus Plus networks.
Data Highway Plus (DH+) Interface Modules: For connectivity to Allen-Bradley's proprietary DH+ network, allowing interoperability with Rockwell Automation systems.
Reliance R-Net Interface Modules: For connecting to Reliance's own peer-to-peer industrial network.
DCS-Net Interface Modules: For integration within Reliance's Distributed Control Systems (DCS).
Serial Communication Modules (e.g., RS-223, RS-485): For point-to-point or multi-drop connections, often used for connecting to Modbus devices, barcode scanners, or other serial equipment.
Network Interface Modules: For connecting to specific industrial networks. Examples include:
PC Link Interface Modules: To allow IBM-compatible personal computers to interface directly with Reliance control networks for data collection, programming, and monitoring.

Product Parameters (General, as specific modules vary widely)

Communication Protocols Supported: RS-232, RS-485, Modbus, Modbus Plus, Data Highway Plus (DH+), Reliance R-Net, AutoMax DCS-Net, AutoMax Remote I/O.
Data Transfer Rates: Varied significantly by protocol and module type (e.g., kilobaud to megabaud).
Physical Connectors: Often D-shell connectors (e.g., 25-pin for RS-232), coaxial connectors (for R-Net, DH+), or terminal blocks.
Network Capacity: Number of nodes or drops supported on a specific network segment (e.g., 32 nodes for Modbus Plus, 56 nodes for DCS-Net).
Power Requirements: Typically derived from the PLC backplane (e.g., 5VDC, 12VDC) with specified current draw (e.g., 650mA).
Diagnostic Indicators: Often included 7-segment LED displays for fault codes and status LEDs (e.g., "OK" indicator).
Configuration: May use thumbwheel switches for network addressing or require software configuration.
Form Factor: Typically rack-mounted cards designed to plug into specific slots in Reliance AutoMax or other PLC chassis.
Operating Temperature: Standard industrial ranges, typically 0°C to 50°C (32°F to 122°F).

Product Advantages (Historically)

Seamless Integration (within Reliance Ecosystem): Provided robust and reliable communication within Reliance Electric's proprietary control systems (AutoMax, DCS 5000).
Interoperability: Enabled connectivity with widely used third-party protocols (Modbus, DH+) for integrating diverse industrial equipment.
Performance: Designed for industrial environments, ensuring reliable data transmission even in the presence of electrical noise and harsh conditions.
Distributed Control: Facilitated the implementation of distributed control architectures, allowing control systems to span large geographical areas or complex processes.
Diagnostic Capabilities: Onboard diagnostics and LED indicators aided in troubleshooting and system monitoring.
Modularity: Allowed for flexible system design and expansion by adding or replacing specific communication interfaces as needed.

Important Considerations

Legacy Status: Reliance Electric automation products are considered legacy. While highly robust, new deployments would typically use Rockwell Automation's current offerings.
Compatibility: Ensure compatibility with the specific Reliance Electric PLC series (e.g., AutoMax) and the target communication network.
Software and Drivers: Proper software configuration tools and drivers were crucial for setting up and utilizing these modules.
Wiring and Installation: Adherence to Reliance Electric's wiring standards and installation guidelines was critical for optimal performance and safety.
Network Design: Understanding the limitations and requirements of each communication protocol (e.g., cable length, termination, number of nodes) was essential for reliable network design.
Documentation: Access to original Reliance Electric manuals is vital for understanding installation, configuration, and troubleshooting.
Support: Direct OEM support for these older modules is limited or non-existent; support often comes from third-party repair services or companies specializing in legacy industrial equipment.

Product Applications (Historical and Current Legacy Use)

Factory Automation: Connecting various machines, PLCs, and supervisory systems on a plant floor.
Process Control: Enabling communication between controllers, sensors, and actuators in industries like chemicals, oil & gas, and power generation.
Distributed Control Systems (DCS): Forming the backbone of large-scale distributed control architectures.
Remote I/O Systems: Extending I/O capabilities over distances, reducing wiring complexity.
Data Acquisition and Monitoring: Facilitating the transfer of process data to host computers for analysis, reporting, and historical trending.
Machine Control: Integrating various machine components and sub-systems for coordinated operation.

7FR4042 RELIANCE

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