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High-Performance CPU for S5-115U Systems
This processor module serves as the central intelligence for your SIMATIC S5-115U automation system. The Siemens 6ES5940-7SA11 executes user programs with exceptional speed and precision. It manages complex control tasks including arithmetic operations and data handling. A built‑in EPROM submodule stores your application code securely. Consequently, this CPU delivers reliable performance for demanding industrial processes.
Processing Power & Memory Architecture
The Siemens 6ES5940-7SA11 provides 32 KB of user memory for your control program. You can expand this capacity using external plug‑in memory submodules. The processor handles bit operations within 1.6 µs per instruction. For word operations, it requires only 8 µs per operation. A lithium battery preserves memory contents during power outages.
| Parameter | Detailed Specification |
|---|---|
| Dimensions (H x W x D) | 13.5 cm x 4.5 cm x 10.0 cm |
| Weight | 0.48 kg (1.06 lbs) |
| Compatible Rack | SIMATIC S5-115U (central or expansion) |
| User Memory | 32 KB RAM (battery‑backed) |
| Memory Expansion | 2 x EPROM submodule slots |
| Bit Operation Time | 1.6 µs per operation |
| Word Operation Time | 8 µs per operation |
| Max Digital I/O | 512 inputs + 512 outputs |
| Max Analog I/O | 64 channels |
| Status LEDs | 4 (RUN, STOP, BATT, FAULT) |
| Communication Port | 1 x TTY (serial programming interface) |
| Energy Storage | Lithium battery (type 6ES5980-0AA11) |
Programming & Software Compatibility
You program the Siemens 6ES5940-7SA11 using standard SIMATIC S5 software tools. The module supports three programming languages: STL, LAD, and CSF. You connect a programming device via the front TTY port for code uploads. The processor also supports remote diagnostics through the same interface. Therefore, maintenance teams troubleshoot issues without physical access.
System Integration & Operational Reliability
You insert this processor into the central rack of your S5‑115U system. The module communicates with I/O cards through the backplane bus automatically. Four front LEDs provide instant status information at a glance. A green RUN light indicates normal program execution. The red FAULT LED signals hardware or software errors immediately.