14C-303U RELIANCE

Reliance 14C-303U Processor module

Brand：RELIANCE Model number：14C-303U

Country of origin: United States Product weight：0.55kg

HS code：9032899099

Product Details：

Product Dimensions：

Reliance Electric processor modules served as the central processing units (CPUs) for their industrial control systems, primarily within the AutoMax PLC series. These modules were responsible for executing control programs, managing data, and coordinating the operation of various I/O and communication modules within a control rack.

Product Details

Functionality: Reliance processor modules were the brains of the control system. They:

Execute application programs written in various languages (e.g., Ladder Logic, Control Block, BASIC).
Process input signals from field devices and generate output signals to actuators.
Manage memory for program storage, data, and diagnostics.
Handle communication with other modules in the rack and with external systems (e.g., HMIs, SCADA systems).
Perform diagnostics and provide status indicators for troubleshooting.

Architecture:

Many Reliance processor modules, especially in the AutoMax series, were based on Motorola 68000 series microprocessors (e.g., 68010, 68020).
They typically plugged into a backplane within a dedicated rack, allowing for communication with other modules in the same rack.
The AutoMax system supported multi-processing, meaning multiple processor modules could be installed in a single rack to increase processing capability and memory.

Key Features:

Multi-language Programming: Support for popular industrial programming languages like Ladder Logic, Control Block, and BASIC.
Multi-tasking Operating System: Allowed for concurrent execution of different tasks based on priority, simplifying program development and management.
Built-in Diagnostics: Often included LED indicators and digital displays (e.g., 7-segment LEDs) for system status and fault codes, aiding in troubleshooting.
Serial Communication Ports: Typically included RS-232C ports for programming, communication with peripheral devices (like printers), or connecting to other control systems.
Modular Design: Allowed for flexible configuration and easy expansion of the control system.

Product Parameters (Examples based on common AutoMax modules like 57C430/57C435)

Microprocessor: Motorola 68010 (16-bit) or 68020 (32-bit) were common.
CPU Speed: Varied, for example, 8 MHz or 25 MHz for different models.
Memory: Typically had RAM (e.g., 135K-150K available for application programs, or 512K parity RAM for some models).
Programming Languages: Ladder Logic, Control Block, BASIC.
Communication Ports: 2 x RS-232C serial ports (one for programmer/Port B, one for Port A).
Rack Compatibility: Designed to be used in AutoMax or DCS 5000 racks.
Indicators: LED status lights (e.g., BAT. OK, OK, COMM OK) and 7-segment LED fault code displays.
Power Supply: Received power from the rack's backplane.

Product Advantages

Robustness and Reliability: Reliance products were engineered for demanding industrial environments, known for their sturdy construction and reliable operation.
Distributed Control Capabilities: The AutoMax system, with its ability to house multiple processors and communicate across racks, facilitated distributed control for complex applications.
Flexible Programming: Support for multiple programming languages offered flexibility for different types of control logic and user preferences.
Integrated Diagnostics: On-board diagnostics simplified troubleshooting and helped minimize downtime.
Scalability: The modular design allowed users to add more processing power or I/O capacity as their application requirements evolved.
Real-time Performance: The underlying "real-time" operating system provided precise and responsive control, crucial for many industrial processes.

Important Considerations

Legacy System: Reliance Electric, as an independent entity, no longer exists, and its PLC lines like AutoMax have been discontinued by Rockwell Automation (who acquired them). This means:

Availability of New Parts: Finding brand new modules can be challenging. Most available modules today are used, refurbished, or surplus.
Support and Spares: Official manufacturer support is limited. Users typically rely on third-party suppliers, repair services, and community knowledge for maintenance and spares.
Software Compatibility: Programming software (e.g., ReSource AutoMax Programming Executive) might be older and require compatible operating systems.

Migration Planning: For critical applications, consider a long-term migration strategy to newer, currently supported PLC platforms.
Documentation: Ensure access to original manuals and datasheets for accurate installation, programming, and troubleshooting.
Battery Backup: Many processor modules had on-board batteries to retain RAM contents. These batteries need periodic replacement.

45C-305 RELIANCE

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