

The Siemens SIMATIC S7-300 CPU 312 (6ES7312-1AE14-0AB0) is a compact, high-performance CPU engineered for medium-scale automation tasks requiring robust processing power and flexible communication. As a cornerstone of the modular S7-300 family, this CPU integrates a real-time clock, comprehensive diagnostics, and dual interface support (MPI and PROFIBUS DP) to enable seamless integration with distributed I/O, drives, and HMI systems. Its expandable memory architecture and modular design allow for precise customization, making it a preferred choice for demanding industrial environments. Below are the detailed technical specifications:
| Parameter | Specification |
|---|---|
| Product Type | Siemens SIMATIC S7-300 CPU 312 |
| Order Number (MLFB) | 6ES7312-1AE14-0AB0 |
| Power Supply Voltage | DC 24 V (20.4 V to 28.8 V) |
| Program Memory (RAM) | Up to 64 KB (expandable via memory module) |
| Data Memory | Expandable via memory module (e.g., 64 KB or 256 KB) |
| Integrated Digital I/O | None (all I/O via external signal modules) |
| Max. Number of Modules | 8 modules (single-row configuration, up to 4 rows with expansion) |
| Max. Digital I/O Points | Up to 256 (with SM modules) |
| Max. Analog I/O Channels | Up to 64 (with SM modules) |
| Communication Interface 1 | MPI (Multi-Point Interface) – up to 12 Mbit/s |
| Communication Interface 2 | PROFIBUS DP Master/Slave – up to 12 Mbit/s |
| Number of MPI Connections | Max. 8 (including programming device and operator panels) |
| Real-Time Clock | Yes (with backup battery) |
| Interrupt Processing | Hardware, diagnostic, and time-of-day interrupts |
| High-Speed Counters | Supported via function modules (FM) |
| Pulse Outputs | Supported via function modules (FM) |
| Programming Software | Siemens STEP 7 (V5.5 or higher) / TIA Portal (optional) |
| Operating Temperature | 0 °C to +60 °C (horizontal installation); 0 °C to +40 °C (vertical) |
| Storage Temperature | -40 °C to +70 °C |
| Relative Humidity | 5% to 95% (non-condensing) |
| Protection Class | IP20 |
| Dimensions (W x H x D) | 40 mm x 125 mm x 130 mm |
| Weight | Approx. 290 g |

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