Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | SIEMENS 6ES5376-0AA31 |
| Manufacturer | Siemens AG |
| Product Type | SIMATIC S5 376 Memory Submodule (EPROM) |
| Memory Technology | NMOS EPROM (Erasable Programmable Read-Only Memory) |
| Storage Capacity | 64 × 2¹⁰ bytes = 64 KB |
| Programming Number | 162 (for use with appropriate EPROM programming devices) |
| Physical Format | Short version (compact form factor) |
| Compatible CPU/Modules | CPU 922, CPU 928, CPU 928B, CP143, CP143 TCP/IP, CP5431 |
| System Compatibility | SIMATIC S5-115U, S5-135U, S5-155U platforms |
| Programming Method | Dedicated S5 EPROM programmer / PG with EPROM programming capability |
| Erase Method | Ultraviolet light exposure (253.7nm wavelength, ~15-20 min) through quartz window |
| Data Retention | Permanent (non-volatile, no battery required) |
| Read Voltage | 5V DC |
| Approximate Weight | 0.05 kg |
| Protection Rating | IP20 (when installed in CPU/module, protected by enclosure) |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +70°C |
| Lifecycle Status | Discontinued by manufacturer; available as new surplus / refurbished spare part |
Main Features and Advantages
Permanent Non-Volatile Program Storage:
The defining advantage of the SIEMENS 6ES5376-0AA31 is its EPROM-based architecture that provides truly permanent data retention without dependency on backup batteries. Once the user program is written to the SIEMENS 6ES5376-0AA31, it remains intact indefinitely—even through power losses, battery failures, or decades of storage. This eliminates the catastrophic risk of program loss that plagues RAM-based memory systems, where a single depleted battery can erase years of validated control logic and bring an entire production line to a standstill. For facilities with limited maintenance resources or harsh environmental conditions that accelerate battery degradation, the SIEMENS 6ES5376-0AA31 is nothing short of a lifesaver.
High Capacity for Complex Automation Programs:
With 64KB of storage capacity, the SIEMENS 6ES5376-0AA31 accommodates substantial user programs—approximately 4,000 to 5,000 STEP 5 instructions depending on instruction length complexity. This capacity makes the SIEMENS 6ES5376-0AA31 suitable for medium to large-scale automation applications including multi-station process control, complex sequencing logic, data logging, and communication handling. As the highest-capacity NMOS EPROM in the 376-0AAxx series, the SIEMENS 6ES5376-0AA31 delivers the storage headroom necessary for sophisticated S5-115U/135U/155U based control systems.
Reusable Through UV Erasure:
Unlike one-time programmable memory devices, the SIEMENS 6ES5376-0AA31 features a transparent quartz window that enables ultraviolet erasure and reprogramming. Using a standard EPROM eraser with 253.7nm wavelength UV light for 15-20 minutes, the contents of the SIEMENS 6ES5376-0AA31 can be completely cleared, allowing the module to be reprogrammed with updated control logic. This reusability makes the SIEMENS 6ES5376-0AA31 an economically sustainable choice for development, testing, and program iteration cycles, as well as for extending the service life of existing modules.
Precise Compatibility with S5 CPU 922/928/928B:
The “short” physical format of the SIEMENS 6ES5376-0AA31 is engineered to fit precisely into the dedicated memory slots of CPU 922, CPU 928, and CPU 928B—the workhorse processors of SIMATIC S5-115U/135U/155U central racks. Additionally, the SIEMENS 6ES5376-0AA31 is fully compatible with CP143, CP143 TCP/IP, and CP5431 communication processors, making it a versatile memory solution across the S5 intelligent processor family. This targeted compatibility ensures the SIEMENS 6ES5376-0AA31 serves as a direct drop-in replacement for failed or aging memory submodules without any adapter or modification.
