Product Overview
The SIEMENS 6ES7952-1AL00-0AA0 is a dedicated RAM memory card designed specifically for the SIMATIC S7-400 programmable logic controller (PLC) system, providing critical expansion of the CPU’s load memory capacity for storing user programs, hardware configuration data, and system blocks. This long-design memory card is a key component in the S7-400 platform, allowing users to accommodate larger and more complex automation applications that exceed the internal memory capacity of the CPU module. The SIEMENS 6ES7952-1AL00-0AA0 features a storage capacity of 2 megabytes, making it suitable for medium to large-scale automation projects that require extensive program logic, data blocks, and system configurations.
As a volatile RAM-based memory solution, the SIEMENS 6ES7952-1AL00-0AA0 offers high-speed read and write performance that is significantly faster than non-volatile alternatives, ensuring optimal system response for demanding process control applications. However, it is important to note that the SIEMENS 6ES7952-1AL00-0AA0 requires battery backup to retain stored data during power interruptions, as the contents will be lost if the CPU battery is depleted or removed. This characteristic makes the SIEMENS 6ES7952-1AL00-0AA0 particularly suitable for applications where frequent program modifications are expected, such as during system commissioning or ongoing process optimization, as the card can be easily rewritten without special programming equipment. The card is inserted directly into the dedicated slot on the front of the S7-400 CPU, providing a simple and secure installation mechanism.
Technical Specifications
| Parameter Name | Value |
|---|---|
| Product Model | 6ES7952-1AL00-0AA0 |
| Manufacturer | Siemens |
| Product Type | RAM Memory Card (MC952 RAMCARD) |
| Series | SIMATIC S7 |
| Memory Type | RAM (Volatile, Battery-Buffered) |
| Memory Capacity | 2 Mbyte |
| Form Factor | Long Design for S7-400 |
| Compatibility | S7-400 Series CPUs |
| Data Retention | Requires CPU Battery Backup |
| Read/Write Characteristics | High-Speed, Unlimited Write Cycles |
| Download Method | Direct Download via SIMATIC Manager |
| Programming Requirement | No Special Programmer Required |
| Weight | Approx. 40-58 g |
| Dimensions | Standard SIMATIC Card Format |
| Certifications | CE, RoHS Compliant |
| EAN/UPC | 4019169009935 |
| Country of Origin | Germany |
Main Features and Advantages
Reliable Memory Expansion for S7-400 Systems: The SIEMENS 6ES7952-1AL00-0AA0 provides essential expansion of the load memory capacity for S7-400 CPUs, enabling the execution of complex user programs that would otherwise exceed the integrated memory limits of the processor. This 2MB RAM card is engineered to seamlessly integrate with the S7-400 architecture, allowing the automation system to handle extensive logic operations, numerous data blocks, and comprehensive hardware configurations without performance degradation. For facilities operating large-scale automation infrastructure, the SIEMENS 6ES7952-1AL00-0AA0 ensures that critical programs and system data have adequate storage space, maintaining operational continuity and supporting future expansions.
High-Speed Data Access and Flexible Rewritability: As a RAM-based memory solution, the SIEMENS 6ES7952-1AL00-0AA0 delivers significantly faster read and write performance compared to Flash or EPROM alternatives, reducing program execution latency and improving overall system responsiveness. The card supports unlimited write cycles, making it ideal for environments where programs are frequently modified during commissioning, process optimization, or system upgrades. The SIEMENS 6ES7952-1AL00-0AA0 can be directly downloaded using standard SIMATIC Manager software, eliminating the need for specialized programming hardware such as the SIMATIC Prommer, which is required for Flash memory cards. This flexibility streamlines engineering workflows and reduces maintenance complexity for plant technicians.
Essential for Hot Configuration and Online Changes: The SIEMENS 6ES7952-1AL00-0AA0 is a critical enabler for applications requiring online program changes and hardware configuration modifications without system shutdown. In process industries such as petrochemical or power generation, the SIEMENS 6ES7952-1AL00-0AA0 supports continuous operation by allowing engineers to download and test modified programs while the plant remains in production. For S7-400H redundant systems, the SIEMENS 6ES7952-1AL00-0AA0 is the recommended memory solution for PCS7 projects where seamless downloads are essential to maintain system availability. While the card’s reliance on battery backup introduces a data retention consideration, users who maintain proper battery health and regular program backups can leverage the performance and flexibility advantages of the SIEMENS 6ES7952-1AL00-0AA0 to maximize system uptime and engineering efficiency.