802267-251W RELIANCE

Reliance 802267-251W programmable controller module

Brand：RELIANCE Model number：802267-251W

Country of origin: United States Product weight：0.55kg

HS code：9032899099

Product Details：

Product Dimensions：

Reliance Electric programmable controller modules were foundational components of their industrial automation systems, primarily part of their AutoMate and AutoMax PLC (Programmable Logic Controller) series. These modules formed the core of control systems for various industrial processes.

Product Details (General Description of a Typical Module)

Reliance programmable controller modules, like those found in the AutoMate and AutoMax series, were designed to be robust and reliable for industrial environments. A typical system would consist of:

Processor Modules: These were the "brains" of the PLC, executing the control logic (often ladder logic, but sometimes also BASIC or control block programming in the AutoMax). They managed the I/O, communications, and overall system operation. Examples include the AutoMate 45C1A or AutoMax 45C202 (R-Net Network Processor Card).
I/O (Input/Output) Modules: These modules served as the interface between the processor and the field devices (sensors, actuators). They came in various types:

Digital Input Modules: For reading discrete (on/off) signals from switches, pushbuttons, etc. (e.g., 45C44 dual 24V AC/DC input modules).
Digital Output Modules: For controlling discrete devices like lights, solenoids, contactors (e.g., 45C60 Dual AC Output Module).
Analog Input Modules: For reading continuous signals like temperature, pressure, or flow from transducers.
Analog Output Modules: For providing continuous control signals to devices like variable speed drives or proportional valves.
Specialty Modules: Such as high-speed counter modules, PID control modules, and communication modules.

Communication Modules: These modules facilitated communication within the PLC system (e.g., R-Net network) and with other devices or higher-level control systems (e.g., RS-232, Ethernet).
Power Supply Modules: To provide stable DC power to the PLC rack and modules.
Chassis/Racks: Backplanes into which the modules were plugged, providing electrical connections and communication pathways.

Product Parameters (Typical for the Era)

Processor Speed: Measured in milliseconds for scan time, varying by model (e.g., faster for AutoMax compared to earlier AutoMate).
Memory: Ranged from a few kilobytes (KB) to several megabytes (MB) for program and data storage (e.g., AutoMate 20E with 4K x 16 non-volatile memory).
I/O Capacity: Could support hundreds to thousands of I/O points, depending on the system configuration and communication capabilities.
Communication Protocols: Often included proprietary protocols like R-Net, as well as industry standards such as Modbus RTU (via serial ports) or early forms of industrial Ethernet.
Voltage: Typically 24V DC for internal logic and various AC/DC voltages for I/O modules (e.g., 24V AC/DC, 115V AC).
Physical Form Factor: Rack-mounted modules, often with terminal blocks for field wiring.
Operating Temperature: Designed for typical industrial ranges (e.g., 0°C to 60°C).

Product Advantages (Historically)

Robustness: Built for harsh industrial environments, ensuring durability and reliability.
Modular Design: Allowed for flexible configuration and scalability, making it easier to adapt to changing application needs and expand the system.
Distributed Control Capabilities: The AutoMax system, in particular, was known for its advanced distributed control capabilities, allowing for coordinated control of multiple drives and processes.
Programming Flexibility: While ladder logic was standard, some advanced platforms like AutoMax offered BASIC and control block programming, providing more complex control possibilities.
Diagnostics: Incorporated diagnostic features to aid in troubleshooting and system maintenance.
Integration with Reliance Drives: As Reliance Electric was also a major drive manufacturer, their PLCs often had strong integration capabilities with their own motor drives (e.g., communicating via fiber optics for motion control).

Important Considerations

Obsolete Status: As mentioned, Reliance Electric programmable controllers are largely obsolete. This presents significant challenges:

Parts Availability: Finding replacement modules can be very difficult and expensive, often requiring reliance on surplus markets.
Technical Support: Official technical support from Rockwell Automation for these legacy products is extremely limited or non-existent.
Programming Software and Hardware: Legacy programming software and interface hardware might be hard to find or may not run on modern operating systems.
Cybersecurity: Older systems were not designed with modern cybersecurity threats in mind and may lack robust security features.

Migration: Companies still using Reliance PLCs often face the challenge of migrating to modern control platforms from Rockwell Automation or other vendors. This can be a complex and costly process.
Specialized Expertise: Maintaining and troubleshooting these older systems requires specialized knowledge and experience with the legacy hardware and software.

Product Applications (Historical)

Reliance programmable controller modules were widely used across various industries for:

Manufacturing and Process Control:

Steel mills (e.g., for controlling rolling mills, wire drawing machines).
Paper and textile industries (for coordinated multi-motor control systems).
Automotive manufacturing.
Food and beverage processing.
Chemical processing.

Material Handling:

Conveyor systems.
Automated storage and retrieval systems (AS/RS).

Power Generation and Distribution:

Control of generators, switchgear, and other electrical equipment.

Water and Wastewater Treatment:

Pump and valve control, process monitoring.

Machine Control:

Controlling individual machines, from simple on/off sequences to complex motion control applications.

R0-51874-2 RELIANCE

We have the same series of models in stock. If you don't find the model you need, please contact us and we will provide you with an official quotation！