Product Overview

The Siemens 6AG1952-1AS00-7AA0 RAM Memory Card is an industrial memory accessory designed for compatible SIMATIC S7-400 programmable logic controller systems. It belongs to the SIPLUS product family and is based on the standard Siemens 6ES7952-1AS00-0AA0 memory card.

This model provides 16 MB of RAM storage in a long-format memory card design. It is intended for use with supported S7-400 CPUs, where it provides additional memory capacity for controller programs and associated data. In industrial automation systems, the correct memory configuration is important for maintaining the required application data and supporting the intended PLC operating environment.

The 6AG1952-1AS00-7AA0 differs from the standard version through its SIPLUS configuration, which includes conformal coating and an extended operating temperature range of -25°C to +70°C. These characteristics make it suitable for selected industrial installations exposed to more demanding environmental conditions than those typically encountered in standard control rooms.

As a RAM memory card, this component should not be confused with a FEPROM or flash-based memory card. RAM is volatile memory, and its behavior and data-retention characteristics depend on the controller design and the applicable backup or retention arrangements. Engineers should check the CPU documentation before removing, replacing, or transferring a memory card.

The complete order number should be checked when sourcing this component. Although the standard 6ES7952-1AS00-0AA0 and the SIPLUS 6AG1952-1AS00-7AA0 share a 16 MB memory capacity, their environmental specifications and product configurations are different.

Technical Specifications

Note: Confirm the card dimensions and insertion compatibility against the exact CPU and manufacturer’s mechanical documentation before installation.

Function and Working Principle

The 6AG1952-1AS00-7AA0 provides RAM memory capacity for a compatible S7-400 controller. Its function is closely related to the CPU’s memory architecture and the way the PLC manages application programs and operating data.

1. PLC Program and Data Storage

A programmable logic controller executes a user program to coordinate industrial equipment. Depending on the CPU architecture and configuration, memory is used for program instructions, data blocks, system information, and other controller resources.

The 16 MB memory capacity provides storage resources for supported S7-400 applications. The exact allocation and usable capacity depend on the CPU model, firmware, and system configuration.

2. RAM Memory Operation

RAM is a volatile memory technology. Unlike non-volatile flash or FEPROM storage, RAM normally requires an appropriate power-retention or backup arrangement to preserve data when power is removed.

The way a particular S7-400 CPU uses its memory card depends on the controller design. Users should consult the CPU manual to understand which program and data areas are stored on the card and what backup arrangements are required.

3. Memory Access During PLC Operation

During normal operation, the CPU accesses its configured memory to execute control logic and process data. The memory card forms part of the controller’s memory arrangement and must be compatible with the CPU.

Correct memory configuration helps the controller operate according to the requirements of the automation application. An incompatible card or incorrect handling procedure can interrupt operation or affect stored data.

4. Environmental Protection

The SIPLUS version includes conformal coating. This protective treatment is designed to improve the resistance of electronic assemblies to certain environmental influences.

The specified operating temperature range is -25°C to +70°C. Actual suitability still depends on the environmental conditions, installation method, and the limits of the connected CPU and other system components.

Role in Industrial Control Systems

The Siemens 6AG1952-1AS00-7AA0 supports the memory requirements of compatible S7-400 PLC installations. It is not a standalone controller or an I/O module; it works as a memory component within the PLC architecture.

PLC Program Management

S7-400 controllers execute control programs for industrial processes, including sequential logic, equipment interlocks, process calculations, and communication tasks.

The memory card provides the specified RAM capacity required by supported controller configurations. Before installation, engineers should verify that the CPU supports the exact memory-card type and capacity.

Data Handling

Industrial PLC applications process input signals, internal variables, status information, and output commands. Memory resources support the handling of these data during controller operation.

The role of the memory card depends on the CPU’s memory organization. It should not be assumed that every program, variable, or retentive data area is stored in the same location.

System Maintenance and Replacement

Memory cards are important when maintaining legacy automation equipment. A replacement card must match the original part number and memory technology.

When replacing a card, technicians should document the controller configuration, confirm backup availability, and follow the manufacturer’s instructions. Removing a RAM card without understanding the CPU’s data-retention arrangement may result in loss of information or interruption of the control process.

Industrial Applications

The SIPLUS S7-400 memory card is intended for compatible industrial automation installations. Its environmental characteristics can be useful in applications where the control equipment operates under a wider temperature range.

1. Manufacturing Automation

Manufacturing plants use S7-400 PLC systems to coordinate production machinery, conveyors, sensors, actuators, and process equipment.

The memory card supports the controller’s configured memory requirements and helps maintain the intended PLC hardware arrangement.

2. Process Control Systems

Process automation applications may use S7-400 controllers to manage pumps, valves, motors, temperature loops, and other equipment.

The 16 MB RAM card can be used where the selected CPU configuration requires this memory capacity. The overall system design must account for the memory requirements of the application program and controller.

3. Power Generation and Utility Facilities

Industrial utilities and power-generation facilities may use PLC systems for auxiliary equipment, monitoring, and equipment sequencing.

In these installations, reliable memory configuration is important because controller faults or incorrect replacement procedures can affect equipment availability.

4. Infrastructure and Environmental Control

Water treatment, ventilation, building infrastructure, and other industrial facilities may use S7-400 PLCs for equipment coordination and monitoring.

The SIPLUS temperature specification may be relevant when the installation environment falls outside the standard temperature range of conventional control equipment.

5. Legacy Automation Maintenance

Many industrial facilities continue to operate established S7-400 systems. When a memory card needs replacement, sourcing the exact model can help reduce the need for controller hardware changes.

The 6AG1952-1AS00-7AA0 is particularly relevant when the original installation specifies the SIPLUS 16 MB RAM card rather than a standard memory card.

Installation and System Integration

Correct handling and installation are essential because the memory card is part of the PLC’s internal memory arrangement.

1. Verify CPU Compatibility

Before installation, confirm that the target CPU supports the 6AG1952-1AS00-7AA0. Check the CPU order number, firmware version, supported memory-card types, and applicable hardware documentation.

Do not assume that every S7-400 CPU accepts every memory card in the same way.

2. Confirm Memory Type and Capacity

This model is a 16 MB RAM memory card. Confirm that the original installation requires RAM rather than FEPROM or another memory technology.

A card with a similar physical appearance but a different memory type may not be a suitable replacement.

3. Follow the Correct Handling Procedure

Electronic memory cards should be handled carefully to prevent electrostatic discharge and physical damage. Use appropriate ESD protection and follow the manufacturer’s insertion and removal procedures.

Before removing an existing card, determine whether the CPU must be stopped and whether the application data has been backed up.

4. Check the Environmental Conditions

The specified operating temperature range is -25°C to +70°C. Ensure that the actual installation conditions remain within the permitted range.

Conformal coating provides additional protection for electronic assemblies, but it does not make the card waterproof or suitable for unrestricted exposure to chemicals, condensation, or corrosive environments.

5. Verify Controller Operation

After installation, follow the CPU’s documented startup and memory-recognition procedure. Check diagnostic indicators, controller status, and the availability of the expected application program.

If the controller reports a memory configuration fault, verify the card type, part number, insertion, and CPU compatibility before returning the system to service.

Compatible System Components

The 6AG1952-1AS00-7AA0 operates as part of a compatible SIMATIC S7-400 PLC system.

The components listed above are examples of equipment that may be used in an S7-400 installation. They are not included with the memory card.

Alternative Models and Replacement Considerations

When replacing a memory card, the most important factors are memory technology, capacity, mechanical format, CPU compatibility, and environmental specification.

A replacement decision should consider the following:

• Exact S7-400 CPU model.
• Supported memory-card types.
• Required memory capacity.
• RAM versus FEPROM technology.
• Long-format mechanical compatibility.
• Operating temperature requirements.
• Conformal-coating requirements.
• Existing program and data backup arrangements.
• Controller firmware and project configuration.

A memory card with a larger capacity is not automatically a compatible replacement. The CPU’s supported memory architecture must be checked before selecting an alternative.

Key Advantages

16 MB RAM Capacity

The card provides 16 MB of RAM memory for supported S7-400 configurations, allowing the controller to use the specified memory arrangement.

SIPLUS Environmental Design

The SIPLUS version includes conformal coating and a specified operating temperature range of -25°C to +70°C.

Compatibility with Established S7-400 Systems

The card is designed for compatible S7-400 CPUs and is relevant to maintenance and replacement work involving existing Siemens automation installations.

Long-Format Memory Card Design

Its long-format construction corresponds to the intended S7-400 memory-card interface. Confirm the exact mechanical requirements of the target CPU before installation.

Industrial Automation Support

The component supports PLC memory requirements in manufacturing, process control, infrastructure, and other industrial applications.

Lightweight Construction

With a supplied weight of 0.046 kg, the card is a compact component that can be stored and transported as an industrial spare part.

Technical FAQs

1. What is the Siemens 6AG1952-1AS00-7AA0?

It is a SIPLUS S7-400 RAM memory card with 16 MB capacity. It is based on the standard 6ES7952-1AS00-0AA0 model and includes conformal coating.

2. What is the memory capacity?

The memory capacity is 16 MB RAM.

3. Which PLC family is this card designed for?

It is designed for compatible Siemens SIMATIC S7-400 CPUs. The exact CPU model must be checked before installation.

4. What is the difference between 6AG1952-1AS00-7AA0 and 6ES7952-1AS00-0AA0?

The 6AG model is the SIPLUS version based on the standard 6ES model. It includes conformal coating and an extended specified operating temperature range of -25°C to +70°C.

5. Is this a RAM or flash memory card?

It is a RAM memory card. It should not be treated as equivalent to a FEPROM or flash-based memory card.

6. Does RAM retain data after power is removed?

RAM is volatile memory. Data retention depends on the CPU’s memory architecture and the supported backup or retention arrangements. Consult the specific CPU documentation before removing the card or disconnecting power.

7. What is the operating temperature range?

The specified operating temperature range is -25°C to +70°C.

8. Can this card replace an 8 MB or 4 MB S7-400 memory card?

Not automatically. Confirm CPU support, application memory requirements, and the original memory configuration before changing capacity.

9. What should be checked before purchasing?

Verify the full order number, memory capacity, RAM technology, card design, environmental specification, physical condition, and compatibility with the target S7-400 CPU.

10. Is this card suitable for industrial spare-parts inventory?

Yes, it can be stocked as a replacement component for compatible S7-400 systems. Store it according to the manufacturer’s handling and environmental recommendations and maintain clear part-number identification.

Procurement and Maintenance Recommendations

When purchasing the Siemens 6AG1952-1AS00-7AA0, verify the complete part number rather than relying only on the description “S7-400 memory card.” Several memory cards share a similar appearance but differ in capacity, memory technology, and environmental configuration.

For replacement projects, compare the existing card with the target CPU’s documentation. Confirm that the system requires a 16 MB RAM card and that the SIPLUS configuration is appropriate for the installation environment.

For used or surplus components, inspect the card body and connector contacts. Request clear photographs of the product label and confirm the unit’s condition, storage history where available, and warranty terms.

During maintenance, back up relevant PLC programs and data before changing memory hardware. Follow the correct CPU shutdown, insertion, and startup procedures. After replacement, check the CPU diagnostic status and verify that the intended application is available.

Maintain an inventory record containing the full order number, base model, memory capacity, and environmental specification. This makes it easier to identify the correct spare part during planned maintenance or unexpected equipment failures.

Conclusion

The Siemens 6AG1952-1AS00-7AA0 is a SIPLUS S7-400 16 MB RAM memory card based on the standard 6ES7952-1AS00-0AA0 model. Its conformal coating and specified operating temperature range of -25°C to +70°C distinguish it from the standard version.

Designed for compatible SIMATIC S7-400 controllers, this memory card supports the memory requirements of established industrial automation systems. Correct CPU compatibility, memory-type verification, and careful handling are essential when installing or replacing the component.