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Secure Program Storage for S5 CPUs
This memory submodule stores your control program securely for SIMATIC S5 processors. The Siemens 6ES5374-0AA11 uses EPROM technology to retain data without external power. You can erase the memory using ultraviolet light and reprogram it as needed. A protective label covers the quartz window to prevent accidental erasure. Consequently, this submodule provides reliable program backup for your S5 system.
Memory Capacity & Physical Design
The Siemens 6ES5374-0AA11 offers 16 KB of storage capacity for user programs. You plug this submodule directly into the front slot of any compatible S5 CPU. The module fits CPUs from the S5-115U, S5-135U, and S5-155U families. A plastic housing protects the sensitive EPROM chip from dust and static discharge. The unit requires no batteries or capacitors for data retention.
| Parameter | Detailed Specification |
|---|---|
| Dimensions (H x W x D) | 2.5 cm x 5.0 cm x 1.2 cm |
| Weight | 0.03 kg (0.07 lbs) |
| Memory Type | UV-EPROM (erasable programmable) |
| Storage Capacity | 16 KB |
| Compatible CPUs | S5-115U, S5-135U, S5-155U |
| Interface Type | 40-pin edge connector |
| Write Protection | Protective label over quartz window |
| Erase Method | UV light (253.7 nm wavelength) |
| Program Voltage | 21V DC (external programmer) |
| Retention Period | 10+ years (no power required) |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Energy Storage | None (non-volatile EPROM) |
Installation & Programming Procedure
You insert the Siemens 6ES5374-0AA11 into the front EPROM slot of your S5 CPU. Use a standard EPROM programmer to write your control code onto the chip. First, you erase the existing data using a UV eraser for 20 minutes. Then you program the chip with your application file. Finally, you apply the protective label over the quartz window.
Operational Advantages & System Reliability
This memory submodule retains your program indefinitely without battery backup. You can store multiple pre‑programmed submodules for different machine configurations. Swapping submodules takes less than one minute during production changeovers. The non‑volatile design also survives power failures and voltage spikes. Therefore, this Siemens submodule offers a failsafe program storage solution for legacy S5 systems.