MeloAuto-Trusted PLC & DCS Parts Supplier
Flexible Program Storage for S5 PLC Systems
The Siemens 6ES5374-2KL21 memory card provides portable program storage for S5-115U and S5-135U controllers. This card enables quick program transfers between different CPUs without requiring a programming device. Maintenance teams rely on this storage solution for efficient system backups and software updates.
Memory Capacity and Storage Technology
This memory card utilizes EPROM technology with a storage capacity of 64 kilobytes for user programs and data. The card organizes memory into 32 kilobyte blocks for program code and 32 kilobytes for data blocks. An integrated erasure window allows UV light clearing for reprogramming when necessary. Furthermore, the card retains stored data for over 10 years without any battery backup.
| Parameter | Specification |
|---|---|
| Model | Siemens 6ES5374-2KL21 |
| Memory Type | EPROM (UV-erasable) |
| Total Capacity | 64 KB |
| Program Storage | 32 KB |
| Data Storage | 32 KB |
| Data Retention | > 10 years (no battery) |
| Access Time | 200 ns (typical) |
| Write Cycles | > 100 |
| Erase Method | UV light (254 nm) |
| Dimensions (W x H x D) | 45 mm x 55 mm x 8 mm |
| Weight | 0.03 kg |
| Compatible CPUs | S5-115U, S5-135U |
Physical Design and Connector Interface
This memory card features a compact 45 mm by 55 mm form factor with a 64-pin edge connector. The gold-plated contacts ensure reliable electrical connections across numerous insertion cycles. A protective label covers the UV erase window, preventing accidental data loss from ambient light. The card’s lightweight design of only 30 grams minimizes stress on the CPU socket.
Programming and Erasure Procedures
You program this memory card using a standard EPROM programmer with 64-kilobyte capacity support. The card accepts data from Siemens programming software via a compatible adapter socket. Erasing the card requires exposing the UV window to 254 nm wavelength light for 20 minutes. After erasure, you must cover the window with an opaque label to prevent data corruption.
Operational Benefits and Application Scenarios
The Siemens 6ES5374-2KL21 allows rapid machine retooling by swapping pre-programmed cards between systems. This card stores complete machine recipes, including setpoints, timers, and counter values. Users can archive multiple production variants and recall them instantly when needed. Consequently, this memory solution reduces changeover times significantly in batch manufacturing processes.
Compatibility and Ordering Information
This memory card works with all S5-115U and S5-135U CPUs that feature a standard EPROM socket. You must verify that your CPU firmware version supports 64 KB memory addressing. The package includes the memory card only; the UV eraser and programmer are separate items. Always handle the card with care to avoid damaging the edge connector or the UV window.