Product Overview

The Siemens 6AG1952-1KT00-4AA0 FLASH EPROM Memory Card is a specialized memory accessory designed for Siemens SIMATIC S7-400 automation systems. It belongs to the SIPLUS product range and is based on the standard 6ES7952-1KT00-0AA0 memory card. With 32 MB of Flash EPROM storage and conformal coating, this memory card is intended for industrial applications where reliable program and data storage is essential.

In an industrial automation system, the programmable logic controller (PLC) executes the control program responsible for coordinating machinery, monitoring signals, and managing production processes. The memory card provides non-volatile storage for the information required by the supported controller. This helps retain the stored program and relevant data when the PLC is powered down or restarted.

The 6AG1952-1KT00-4AA0 is particularly relevant to S7-400 installations that require a compatible Flash EPROM memory card. Its SIPLUS design incorporates conformal coating to provide additional protection for the electronic assembly under specified environmental conditions.

Unlike ordinary removable storage devices used in personal computers, this card is designed for a specific industrial controller platform. Its electrical interface, memory organization, physical format, and supported functions must match the requirements of the S7-400 CPU.

For maintenance engineers, system integrators, and industrial spare-parts buyers, identifying the complete part number is important. A memory card with a similar capacity may not be compatible with the installed CPU or may use a different memory technology.

Technical Specifications

Note: The dimensions and weight are the supplied product-listing values. Verify the physical card and the applicable CPU documentation before installation.

Function and Working Principle

The primary function of the 6AG1952-1KT00-4AA0 is to provide non-volatile memory storage for a compatible SIMATIC S7-400 controller.

1. Non-Volatile Program Storage

A PLC requires memory to store the instructions and information used during machine operation. The Flash EPROM technology used in this card retains stored information without requiring continuous power.

This is important for industrial equipment that may be shut down for maintenance, experience planned power interruptions, or require program retention during controller servicing.

When used with a supported CPU, the memory card provides a storage medium for the controller’s configured program and data.

2. Flash EPROM Technology

Flash EPROM is a type of non-volatile semiconductor memory. It allows stored information to be retained when the power supply is removed.

Compared with volatile memory, which requires continuous power to maintain its contents, Flash EPROM is suitable for retaining information across normal shutdown and restart cycles.

The memory card is designed for its intended SIMATIC S7-400 application rather than as a general-purpose USB or computer memory device.

3. PLC Program Management

In an S7-400 installation, the CPU executes the control program while the memory card provides the supported storage functions.

Depending on the CPU and system configuration, the stored information may include:

• PLC application programs.
• Configured control information.
• Relevant data blocks.
• Program and system information supported by the CPU.

The exact memory functions depend on the specific S7-400 CPU and its operating-system requirements. Engineers should consult the CPU manual before transferring or replacing a memory card.

4. Data Retention During Power Loss

Non-volatile memory helps preserve stored information when the controller is switched off. This supports maintenance procedures and reduces dependence on continuous electrical power for retaining the card’s contents.

However, the card should not be treated as a substitute for a complete backup strategy. Important PLC projects should also be stored in an approved engineering workstation or maintenance archive.

5. Conformal Coating Protection

The 6AG1952-1KT00-4AA0 belongs to the SIPLUS range and includes conformal coating.

This coating provides an additional protective layer over electronic components and circuit-board surfaces. It is intended to improve resistance to specified environmental stresses, such as certain forms of chemical contamination and moisture exposure.

The coating does not make the card waterproof or suitable for unrestricted exposure to liquids. The actual operating environment must remain within the manufacturer’s specified conditions.

Role in Siemens SIMATIC S7-400 Control Systems

The SIMATIC S7-400 is a modular PLC platform used in industrial automation and process-control applications. It supports complex control tasks and can be configured with different CPUs, communication modules, power supplies, and signal modules.

The 6AG1952-1KT00-4AA0 serves as a memory accessory within a compatible S7-400 configuration.

1. PLC Program Storage

The card provides non-volatile storage for supported controller information. This is important in systems where the PLC program must remain available after a shutdown or maintenance operation.

Correct card selection helps ensure that the controller can access the required stored information.

2. Controller Maintenance

During maintenance, a compatible memory card can be used as part of an approved program-storage and restoration procedure.

Before replacing a card, technicians should confirm that the stored project and card configuration are suitable for the target CPU. A card should not be assumed to contain the latest program simply because it has the correct part number.

3. System Configuration Management

Industrial facilities often maintain documentation for PLC hardware, software versions, and program revisions. Memory-card identification is one part of this process.

Recording the card’s complete order number, associated CPU, and project revision can help maintenance teams avoid installing an incompatible or outdated storage device.

4. Support for Industrial Controller Availability

A properly configured memory system helps the PLC retain the information required for operation. This contributes to more predictable maintenance and recovery procedures.

For critical installations, memory-card management should be combined with verified project backups, CPU compatibility checks, and documented recovery procedures.

Industrial Applications

The 6AG1952-1KT00-4AA0 is intended for compatible Siemens S7-400 controller installations. Its use is determined primarily by the controller platform and the environmental requirements of the application.

1. Manufacturing Automation

Manufacturing plants use S7-400 PLCs to coordinate production machinery, conveyors, assembly equipment, and material-handling systems.

The memory card supports the storage requirements of compatible controllers used in these installations.

2. Process Control Systems

Industrial process-control facilities may use S7-400 controllers to manage pumps, valves, motors, instrumentation, and process sequences.

Reliable storage of controller information is important for maintenance and recovery planning. The SIPLUS memory card can be used where its specifications match the installation requirements.

3. Power Generation and Utilities

Power generation and utility facilities often operate automation systems that require documented maintenance procedures and reliable program retention.

A compatible S7-400 memory card may form part of the controller’s storage arrangement. Its use must follow the CPU manufacturer’s requirements and the facility’s engineering standards.

4. Chemical and Process Industries

Chemical and process plants may expose control equipment to environmental conditions that require additional protection.

The conformal coating on the SIPLUS card is designed to provide additional resistance to specified environmental stresses. Engineers must still evaluate the actual cabinet environment, temperature, humidity, and chemical exposure.

5. Infrastructure and Building Automation

Large infrastructure systems may use industrial PLCs for equipment monitoring, utility control, and automated facility operations.

The memory card can support compatible S7-400 installations where non-volatile program storage is required.

Installation and System Integration

Correct installation is essential for memory-card recognition and reliable controller operation.

1. Verify CPU Compatibility

Before installation, identify the exact SIMATIC S7-400 CPU model and consult its hardware documentation.

The 6AG1952-1KT00-4AA0 is based on the 6ES7952-1KT00-0AA0 Flash EPROM card. However, compatibility should be confirmed for the target CPU, firmware, and system configuration.

Do not assume that every S7-400 CPU supports every memory-card type or capacity.

2. Check the Memory Configuration

Confirm that the controller supports a 32 MB Flash EPROM card and that the card is suitable for the intended program-storage function.

If replacing an existing card, record its part number and relevant project information before removal.

3. Follow the Manufacturer’s Installation Procedure

Install the card only in the designated memory-card interface and follow the CPU’s handling instructions.

Avoid touching exposed electrical contacts. Protect the card from electrostatic discharge and mechanical damage during handling.

4. Confirm Program and Data Requirements

Before commissioning, verify that the card contains the correct project information for the target controller.

Where a program transfer or restoration is required, follow the documented Siemens procedure. Do not interrupt an active memory operation or remove the card while the controller is accessing it.

5. Verify Controller Operation

After installation, confirm that the CPU recognizes the memory card and starts according to the intended configuration.

Check diagnostic indicators and controller status. If a fault occurs, verify the card type, seating, CPU compatibility, and stored program before assuming that the card itself is defective.

6. Maintain Backup Records

Keep an independent backup of the PLC project and relevant configuration files.

The memory card is one part of the controller’s storage arrangement; it should not be the only copy of critical automation software.

Compatible System Components

The 6AG1952-1KT00-4AA0 is designed for use within the Siemens S7-400 platform. Other components must be selected according to the CPU and system configuration.

The table describes typical components within an S7-400 automation system. It does not imply that every listed component is included with the memory card or that all combinations are automatically compatible.

Alternative Models and Replacement Considerations

The 6AG1952-1KT00-4AA0 is a SIPLUS version based on the standard 6ES7952-1KT00-0AA0 memory card.

When considering alternatives, memory technology, capacity, physical format, CPU compatibility, and environmental protection must all be checked.

A replacement should be selected only after confirming the complete order number and the target CPU’s supported memory-card configuration.

Key Advantages

32 MB Flash EPROM Storage

The card provides 32 MB of non-volatile memory for supported S7-400 controller storage functions.

Data Retention Without Continuous Power

Flash EPROM retains stored information when power is removed, supporting controller shutdown and maintenance procedures.

SIPLUS Conformal Coating

The conformal coating provides additional protection for the electronic assembly under the specified environmental conditions.

Designed for SIMATIC S7-400

The card is developed for the S7-400 platform rather than general-purpose computing equipment, making exact CPU compatibility an important selection factor.

Compact Industrial Memory Accessory

Its supplied dimensions of 130 × 90 × 10 mm and weight of 0.047 kg make it a lightweight component for industrial spare-parts management.

Support for Maintenance and Program Recovery

When correctly configured and maintained, the card can form part of a documented PLC program-storage and recovery strategy.

Technical FAQs

1. What is the Siemens 6AG1952-1KT00-4AA0?

It is a SIPLUS S7-400 Flash EPROM memory card with 32 MB capacity and conformal coating. It is based on the standard 6ES7952-1KT00-0AA0 card.

2. What is the memory capacity?

The card provides 32 MB of Flash EPROM storage.

3. What is the difference between 6AG1952-1KT00-4AA0 and 6ES7952-1KT00-0AA0?

The 6AG1952-1KT00-4AA0 is the SIPLUS version with conformal coating and specified environmental characteristics. It is based on the standard 6ES7952-1KT00-0AA0 memory card.

4. Which PLC system is this card designed for?

It is designed for the Siemens SIMATIC S7-400 platform. The exact CPU model must be checked to confirm support for this card and its capacity.

5. Does the card retain information when power is removed?

Yes. Flash EPROM is non-volatile memory, so stored information does not require continuous power for retention.

6. What is the operating temperature range?

The product data for this SIPLUS version specifies an operating temperature range of 0…+60°C.

7. Can it be used as a USB memory card?

No. It is a dedicated industrial memory card for a compatible Siemens S7-400 controller interface, not a standard USB storage device.

8. Can it replace every S7-400 memory card?

No. Memory-card types, capacities, and supported functions vary. Always check the target CPU documentation and the existing card’s complete part number.

9. What should be checked before purchasing?

Confirm the full order number, memory capacity, card condition, CPU compatibility, and whether the card is new, used, or refurbished. For critical systems, request appropriate inspection or functional verification.

10. Is the conformal coating waterproof?

No. Conformal coating provides additional protection against specified environmental stresses, but it does not make the card waterproof or suitable for unrestricted liquid exposure.

Procurement and Maintenance Recommendations

When purchasing the Siemens 6AG1952-1KT00-4AA0, verify the complete order number and distinguish it from the standard 6ES7952-1KT00-0AA0 version. Although the two models are related, their environmental protection characteristics are different.

For replacement projects, check the installed S7-400 CPU, supported memory-card capacity, and required memory technology. Confirm that the card’s contents and project revision match the intended controller configuration.

For used or surplus cards, inspect the housing and contacts for physical damage, contamination, or corrosion. Ask the supplier for clear photographs, product identification, and available testing information. Where the PLC is part of a critical process, maintain an independent backup of the controller program before replacing memory hardware.

During maintenance, handle the card using appropriate electrostatic-discharge precautions. Avoid unnecessary removal and insertion, and follow the CPU manufacturer’s procedures for memory access and replacement.

Conclusion

The Siemens 6AG1952-1KT00-4AA0 SIPLUS S7-400 FLASH EPROM Memory Card is a 32 MB non-volatile storage accessory based on the 6ES7952-1KT00-0AA0 model. Its conformal coating provides additional protection for specified industrial environmental conditions, while its dedicated S7-400 design supports compatible PLC memory-storage applications.

For industrial automation maintenance and spare-parts procurement, the most important considerations are memory capacity, Flash EPROM technology, CPU compatibility, environmental requirements, and correct program management. Verifying these details before installation helps reduce compatibility issues and supports reliable operation of existing SIMATIC S7-400 control systems.