1. Product Overview

The Schneider Electric TSXMRPC768K Configurable SRAM Application/File Memory Expansion is a memory expansion accessory designed for compatible Schneider Electric Modicon Premium PLC processors. It provides additional static random-access memory (SRAM) for application programs and data files, helping users manage the memory requirements of established industrial automation systems.

In PLC-based control systems, memory capacity directly affects how application programs, data tables, and operating information can be organized. As control applications become more complex, the available memory in a processor may become a limiting factor. A compatible memory expansion card provides an additional storage resource within the supported controller architecture.

The TSXMRPC768K supports a configurable allocation between application memory and data-file storage. Its nominal memory capacity is 768 KB, with the allocation divided between the application and data areas according to the supported configuration. The documented application-memory range is 192 KB to 768 KB, while the data-file allocation varies inversely from 576 KB down to 0 KB.

This flexibility allows system engineers to allocate memory according to the requirements of a particular PLC application. A control program that requires more application space can use a larger portion of the available memory for the program, while an application with greater data-storage requirements may reserve more capacity for data files.

The TSXMRPC768K is intended for compatible Modicon Premium processor platforms and is installed in the designated memory-card slot. Because it is a legacy automation component, buyers and maintenance engineers should verify the processor reference, firmware and software environment, memory configuration, and physical condition before installation or replacement.

For industrial facilities maintaining existing Schneider Electric PLC systems, this memory expansion can be relevant when preserving an established control architecture is preferable to undertaking a complete controller migration.

2. Technical Specifications

The dimensions and weight above are the supplied product data. Compatibility and memory allocation should be confirmed against the exact processor model and the configuration documentation for the installed PLC system.

3. Function and Working Principle

3.1 SRAM-Based Memory Expansion

SRAM is a type of semiconductor memory that allows data to be accessed electronically without the mechanical operations associated with conventional storage devices. In a PLC environment, memory is essential for holding application instructions and the data required during controller operation.

The TSXMRPC768K provides additional SRAM capacity for supported Modicon Premium processors. When correctly installed and configured, it extends the memory resources available to the controller within the limits established by both the processor and the memory card.

The effective memory capacity is not determined by the card alone. The processor model also imposes its own limits, so the usable capacity is subject to the lower of the supported processor limit and the memory-card limit.

3.2 Configurable Application and Data-File Allocation

The TSXMRPC768K is designed to divide its memory between two principal purposes:

• Application memory: Space used for the PLC application program.
• Data-file memory: Space allocated to application data files and other supported data-storage functions.

Its documented allocation range allows application memory to increase from 192 KB to 768 KB, while data-file memory decreases from 576 KB to 0 KB. The selected allocation should match the memory requirements of the actual application.

For example, a program with more control routines, calculations, and logic may require a larger application-memory allocation. A system that relies on more stored data may need additional data-file capacity instead.

These ranges describe configurable limits, not a guarantee that every processor or software configuration can use every possible allocation. Engineers should verify the available memory and the supported configuration in the relevant programming environment.

3.3 Supporting PLC Application Management

A PLC program contains the logic that determines how a machine or process responds to inputs, operating conditions, and commands. Depending on the installation, it may include sequencing, interlocks, timing operations, communication routines, and equipment-control logic.

The memory expansion helps accommodate the application within the capacity supported by the controller. It does not independently execute the control program or replace the processor. The processor remains responsible for executing logic, processing supported inputs and outputs, and communicating with other system components.

The card’s purpose is to provide additional memory resources to a compatible controller, not to increase processor speed or add new input/output channels.

3.4 Online Modification Considerations

Schneider Electric documentation for this class of memory expansion indicates that applications stored in SRAM memory can support online program modifications under supported system conditions. However, the actual capability depends on the processor, programming software, application structure, and system configuration.

Before modifying a running controller, engineers should confirm the applicable programming procedure and backup requirements. Online changes must be evaluated against process-safety requirements and the risk of interrupting production.

4. Role in Industrial Automation Systems

4.1 Maintaining Established PLC Applications

Many industrial facilities operate automation systems that have been commissioned for years. Their control logic may be closely integrated with machinery, electrical cabinets, operator interfaces, and plant procedures.

Replacing a PLC solely because its memory resources are insufficient can involve considerable engineering work. It may require program conversion, hardware changes, communication testing, validation, and production downtime.

Where the existing processor supports it, a suitable memory expansion may provide a practical option for maintaining the original architecture. The TSXMRPC768K can therefore be relevant to legacy-system maintenance, subject to verification of the specific controller and application requirements.

4.2 Supporting Application and Data Organization

The separation between application memory and data-file memory allows system designers to plan how the controller uses its available resources.

The application-memory area supports the control program, while the data-file area can support data structures and other storage functions provided by the PLC platform. The appropriate allocation depends on the software design and the memory demands of the operating process.

A properly planned memory configuration can help engineers avoid exceeding the controller’s supported capacity and simplify the maintenance of established applications.

4.3 Preserving Existing Control Infrastructure

A memory expansion may be useful when a facility needs to retain a compatible processor, existing I/O modules, communication interfaces, and established engineering practices.

It should not, however, be treated as a universal solution for increasing the capacity of any Schneider Electric PLC. Product compatibility is specific to the supported Modicon Premium processor families and their relevant configurations.

5. Industrial Applications

The TSXMRPC768K is associated with compatible legacy PLC systems. Its practical application depends on the control program, processor model, and the wider automation architecture.

Manufacturing and Assembly Lines

Manufacturing systems often use PLC programs to coordinate machine sequences, interlocks, timing functions, and equipment status. Additional application memory may be relevant where the existing processor supports a larger program configuration.

Typical examples include assembly stations, packaging machinery, material-handling equipment, and production-line control panels.

Process Automation

Industrial process equipment may use PLC logic for operating sequences, permissive conditions, alarms, and data handling. The memory expansion can support the existing application where the processor’s memory configuration is compatible with the required program.

The card itself does not provide process measurement, closed-loop control, or communication functions independently; those capabilities depend on the processor, I/O modules, software, and connected instruments.

Water and Utility Equipment

Legacy PLCs are used in pumping stations, water-treatment equipment, utility skids, and related installations. Where a compatible Modicon Premium processor remains in service, maintaining the correct memory configuration can form part of the overall spare-parts and lifecycle-management strategy.

Material Handling and Packaging

Conveyors, packaging systems, and automated handling equipment may use sequential control logic and stored operating data. A supported memory expansion can help maintain the existing controller configuration when the application requires the associated memory allocation.

Maintenance of Legacy Industrial Systems

One of the most relevant use cases is replacement of an existing memory card during maintenance or repair. In such cases, the replacement should match the required part number and memory configuration. A card with a similar appearance or a larger nominal capacity is not automatically interchangeable.

6. Installation and System Integration

Correct installation is important because a memory expansion directly affects the controller’s ability to access its application and data resources.

6.1 Confirm Processor Compatibility

Before installation, identify the exact PLC processor model and confirm that it supports the TSXMRPC768K. The documented compatibility family includes TSX570 to TSX576, TSX57C, and TSXPCI572/3, but the complete processor reference and system configuration must be checked.

Do not rely solely on the broad Modicon Premium family name when selecting a replacement.

6.2 Verify the Required Memory Allocation

Determine the application’s required program-memory and data-file capacity. The card supports configurable allocation within its documented limits, but the available memory is also constrained by the processor.

If replacing a card from an operating system, record the existing configuration and confirm that the replacement can support the same allocation.

6.3 Follow the Approved Installation Procedure

The card is intended for the designated slot on supported processors. Installation should follow the applicable hardware documentation and site procedures.

Before handling the component, observe electrostatic-discharge precautions. Confirm the required equipment shutdown or isolation procedure rather than inserting or removing the card while the system is operating unless the manufacturer explicitly permits that operation for the exact configuration.

6.4 Back Up the Application

Before changing memory hardware, make a verified backup of the PLC application and any relevant data that must be retained. Check that the backup can be accessed and restored using the available engineering software.

A memory card should not be assumed to contain a complete, current, or recoverable copy of the running application simply because it was removed from an operating controller.

6.5 Verify Configuration and Operation

After installation, follow the approved procedure to confirm that the processor recognizes the card and that the memory configuration is correct. Check the application status, diagnostic messages, and relevant system parameters.

If the card is being used to restore a failed controller, validate the program and process operation before returning the equipment to normal service.

6.6 Consider Data Retention

SRAM is volatile memory technology, so data retention depends on the memory-card design and its supported backup arrangements. Confirm the applicable battery or retention requirements from the manufacturer’s documentation for the exact card and system.

Do not assume that stored application or data files will remain intact indefinitely after power loss or prolonged storage. For legacy equipment, documenting the backup procedure is particularly important.

7. Compatible System Components

The following components and systems are relevant to evaluating the TSXMRPC768K installation. Compatibility must be confirmed against the exact hardware references.

This table describes functional relationships rather than guaranteeing that every listed component can be combined in every installation.

8. Related Memory Expansion Models

The following models belong to the broader family of Schneider Electric memory expansion products. They are comparison candidates only; they are not confirmed direct replacements for the TSXMRPC768K.

Selecting an alternative requires checking the processor’s supported memory cards, memory technology, application requirements, card configuration, and engineering software compatibility. A model with greater capacity should not be considered a direct substitute without this verification.

9. Key Advantages

Configurable Memory Allocation

The TSXMRPC768K allows the supported memory capacity to be allocated between application and data-file storage. This gives engineers flexibility when matching memory resources to the needs of an established PLC program.

Compact, Lightweight Design

With supplied dimensions of 132 × 91 × 26 mm and a weight of 0.076 kg, the unit is a compact accessory intended for integration into supported control hardware.

Support for Legacy Automation Maintenance

For facilities that continue to operate compatible Modicon Premium processors, the card may help maintain an existing hardware configuration without requiring an immediate change to the complete control system.

Defined Compatibility Scope

The documented processor compatibility families and memory-allocation ranges provide a starting point for evaluating whether the component is suitable for a specific maintenance requirement.

Useful for Spare-Parts Planning

Identifying the exact model and keeping an appropriate spare can help maintenance teams prepare for failures involving legacy memory hardware. The card should still be inspected and verified before installation.

10. Technical FAQs

Q1: What is the Schneider Electric TSXMRPC768K?

The TSXMRPC768K is a configurable SRAM application/file memory expansion designed for compatible Schneider Electric Modicon Premium PLC processors.

Q2: What is the memory capacity of the TSXMRPC768K?

The nominal capacity is 768 KB. The documented application-memory allocation ranges from 192 KB to 768 KB, while the data-file allocation ranges from 576 KB to 0 KB. The effective usable memory also depends on the processor and its configuration.

Q3: Which PLC systems support the TSXMRPC768K?

The documented compatibility families include TSX570 to TSX576, TSX57C, and TSXPCI572/3. Confirm the full processor reference and hardware configuration before ordering.

Q4: Is the TSXMRPC768K a PLC CPU?

No. It is a memory expansion accessory. It does not independently execute the control program or replace the PLC processor.

Q5: Can the TSXMRPC768K replace another memory expansion card?

Not automatically. Different memory expansion cards may use different technologies, capacities, and allocation arrangements. Compatibility must be verified against the processor and the original memory configuration.

Q6: Is the TSXMRPC768K discontinued?

Schneider Electric regional product information identifies this reference as discontinued and indicates that it has no direct replacement listed. Availability of service and spare parts may vary by region and lifecycle status, so confirm the current situation before purchasing.

Q7: What are the dimensions and weight of the TSXMRPC768K?

The supplied dimensions are 132 × 91 × 26 mm, and the supplied weight is 0.076 kg.

Q8: What should be checked before purchasing this component?

Confirm the complete part number, processor compatibility, required application/data memory allocation, physical condition, and any applicable backup or retention requirements. For used or surplus stock, ask the supplier to confirm the item supplied matches the requested reference.

Q9: Does a higher-capacity card automatically improve PLC performance?

No. A larger memory card does not inherently increase processor speed or execution performance. Its main purpose is to provide memory capacity within the limits supported by the processor.

Q10: Is a backup recommended before replacing the memory card?

Yes. A verified application backup and an appropriate recovery plan are recommended before changing memory hardware. Follow the manufacturer’s procedures and the facility’s operational safety requirements.

11. Procurement and Replacement Considerations

Because the TSXMRPC768K is a legacy component, procurement should focus on exact identification and application compatibility rather than capacity alone.

Before placing an order, confirm the model number against the existing card or equipment documentation. Ask the supplier to clarify whether the part is new, unused surplus, refurbished, or previously installed, and request photographs of the actual item when appropriate.

For replacement projects, compare the required memory allocation with the processor’s supported configuration. If an alternative model is proposed, verify that it is supported by the exact processor and software environment. Similar product names or a higher memory rating do not establish interchangeability.

For critical production equipment, plan for application backup, installation, diagnostic checks, and operational validation. This helps reduce the risk of unexpected downtime when maintaining older automation systems.

12. Conclusion

The Schneider Electric TSXMRPC768K Configurable SRAM Application/File Memory Expansion is a specialized memory accessory for compatible Modicon Premium PLC processors. Its configurable allocation between application memory and data-file storage makes it relevant to maintaining established PLC applications where the existing controller architecture remains in service.

With a nominal capacity of 768 KB, a supplied weight of 0.076 kg, and compatibility limited to supported processor configurations, the TSXMRPC768K should be selected according to the actual system requirements. Because it is a legacy product with no direct replacement identified in the referenced Schneider Electric product information, exact part-number verification and careful compatibility checks are essential.

For industrial automation maintenance, repair, and spare-parts procurement, confirming the processor model, memory allocation, and product condition before installation helps support reliable replacement planning and continued operation of legacy control systems.