The SIEMENS SIMATIC S7-300 CPU 312C, model 6ES7312-5BD00-0AB0, is a compact yet powerful PLC designed for mid-range automation applications requiring integrated I/O and high-speed processing. This CPU combines a 24V DC power supply, 16 KB working memory, and an MPI interface, making it an excellent choice for machine builders and system integrators in chemical, electronics, and general industrial environments. Its compact form factor and onboard digital I/O reduce wiring and component count, while the support for Micro Memory Cards (MMC) up to 8 MB ensures ample storage for complex user programs. Below are the detailed technical specifications derived from Siemens’ official documentation.
| Specification |
Details |
| Product Type |
SIMATIC S7-300 CPU 312C Compact CPU with MPI |
| Order Number (MLFB) |
6ES7312-5BD00-0AB0 |
| Power Supply |
Integrated 24V DC (19.2V to 28.8V range) |
| Working Memory |
16 KB (for program and data blocks) |
| Load Memory |
Micro Memory Card (MMC) required; max. 8 MB |
| Retentive Memory |
32 KB (for retentive data blocks) |
| Digital Inputs (DI) |
10 (24V DC, integrated) |
| Digital Outputs (DO) |
6 (24V DC, 0.5A each, integrated) |
| High-Speed Counters |
2 x 10 kHz (for incremental encoder or pulse signals) |
| Communication Interface |
1 x MPI (RS485, up to 12 Mbit/s) |
| Bit Operation Time |
0.1 µs (typical) |
| Word Operation Time |
0.24 µs (typical) |
| Fixed-Point Arithmetic |
0.32 µs (typical) |
| Floating-Point Arithmetic |
1.1 µs (typical) |
| Max. Number of Data Blocks (DBs) |
1024 |
| Max. Number of FBs/FCs |
1024 each (max. 32 KB per block) |
| Organization Blocks (OBs) |
OB1, OB10, OB20/21, OB32/33/34/35, OB40, OB100, OB80/82/85/87, OB121/122 (comprehensive set) |
| S7 Counters |
Unlimited (limited by RAM); retentive |
| S7 Timers |
Unlimited (limited by RAM); retentive |
| Programming Software |
STEP 7 V5.5 + SP1 or higher; or STEP 7 V5.2 + SP1 with HSP 218 |
| Dimensions (W x H x D) |
40 mm x 125 mm x 130 mm (approx.) |
| Weight |
Approx. 290 g |
| Ambient Temperature |
0°C to 60°C (operating); -40°C to 70°C (storage) |
| Protection Class |
IP20 (with appropriate enclosure) |
| Certifications |
CE, cULus, FM, ATEX (for hazardous areas when installed correctly) |
What Does Our Clients Say
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Great product!
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Original and fast!
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