Detailed Description:
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Core Purpose: Serves as the external load memory for S7-300/400 CPUs. The CPU reads the program and data from the MMC card into its internal work memory for execution. Data is retained after power loss.
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Battery-Free Operation: CPUs using an MMC card can achieve maintenance-free, battery-less operation. This is because the program and configuration information are permanently stored on the MMC, eliminating the need for a backup battery to maintain RAM data.
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Program & Data Transfer: This card is the standard tool for program archiving and copying projects between CPUs. Engineers can create a project on a programming device (PG/PC), download it to the MMC card, and then insert the card into the target CPU.
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Proprietary Format: The MMC card uses a Siemens proprietary format. It generally cannot be directly read from or written to using standard card readers. Operations must be performed via STEP 7 programming software and a Siemens-specific PG/PC adapter or a programming device with an integrated card slot.
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Capacity Identification: The “1AP00” in the model number typically corresponds to a 128 KB storage capacity. This is one of the smaller capacity MMC models, suitable for applications with modest program sizes.
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Physical Characteristics: The card is compact, similar in size to a standard MMC card, but features a Siemens-specific electrical interface and file system.
Key Specifications:
| Parameter | Details |
|---|---|
| Model | 6ES7952-1AP00-0AA0 |
| Product Type | Micro Memory Card (MMC) |
| Compatible Series | SIMATIC S7-300， S7-400 (consult specific CPU manual) |
| Storage Capacity | 128 KB |
| Memory Type | Flash (Non-volatile) |
| Primary Functions | Serves as CPU load memory, enables battery-less operation, project backup and transfer |
| Data Retention | Typically >10 years (without power) |
| Read/Write Method | Must use STEP 7 software and Siemens-specific programming device/adapter |
| Dimensions | Standard Micro Memory Card size |
