Siemens S7-1200 CPU 1212C DC/DC/DC
Part Number: 6ES7212-1AE40-0XB0
In StockCompact SIMATIC PLC with order number 6ES7212-1AE40-0XB0: 24 V DC supply, integrated digital/analog I/O, onboard PROFINET, and TIA Portal programming. An economical, powerful controller for small to medium automation projects.
Siemens SIMATIC S7-1200 CPU 1212C DC/DC/DC
The Siemens 6ES7212-1AE40-0XB0 (CPU 1212C DC/DC/DC) is one of the most compact controllers in the S7-1200 family. With 24 V DC supply, 8 integrated digital inputs, 6 digital outputs, and 2 analog inputs, it is ideal for small to medium automation tasks. The onboard PROFINET interface enables direct integration with HMIs, drives, and higher-level SCADA systems.
Integrated I/O and Motion Control
Six of the onboard digital inputs can be configured as high-speed counters (HSC); pulse outputs support PTO/PWM applications. These features reduce the need for expansion modules in conveyors, dosing, packaging, and simple axis control.
Memory and Performance
100 KB work memory and 2 MB load memory accommodate moderately complex LAD/FBD/SCL programs. Load memory can be expanded with a SIMATIC memory card; 14 KB retentive memory protects critical data during power loss.
Programming and Engineering
Programmed with TIA Portal STEP 7 (V20+). Modern engineering tools including web server, PID blocks, data logging, and ProDiag are supported. Firmware V4.7 delivers current security and performance improvements.
Expansion and System Architecture
CPU 1212C expands with up to 2 signal modules (SM), 3 communication modules (CM), and 1 signal board (SB). Distributed I/O and drive networks can be built over PROFINET; the modular S7-1200 architecture scales easily to your application.
Technical Specifications
| Order number (MLFB) | 6ES7212-1AE40-0XB0 |
|---|---|
| Product type | CPU 1212C DC/DC/DC (compact) |
| Manufacturer | Siemens SIMATIC |
| Supply voltage | 24 V DC (20.4–28.8 V DC) |
| Power loss (typical) | 9 W |
| SM/CM bus current (5 V DC) | 1000 mA max. |
| Sensor power (24 V DC) | 300 mA max. |
| Integrated digital inputs | 8 (24 V DC, ~4 mA per input) |
| Integrated digital outputs | 6 (24 V DC, sourcing/sinking) |
| Integrated analog inputs | 2 (0–10 V DC) |
| Work memory | 100 KB |
| Load memory | 2 MB integrated (expandable via SIMATIC memory card) |
| Retentive memory | 14 KB |
| Process image | 1024 bytes inputs / 1024 bytes outputs |
| Bit memory (M) | 4096 bytes |
| Temporary memory | 16 KB (startup/program cycle) |
| PROFINET interface | 1 (PROFINET IO Controller/Device) |
| Signal module (SM) expansion | 2 modules max. |
| Communication module (CM) expansion | 3 modules max. |
| Signal Board (SB) | 1 max. |
| High-speed counters (HSC) | Up to 6 (100/180 kHz on Ia.0–Ia.5) |
| Pulse outputs (PTO/PWM) | Up to 4 (100 kHz Qa.0–Qa.3; 20 kHz Qa.4–Qa.5) |
| Pulse catch inputs | 8 |
| Interrupts | 4 time-delay + 4 cyclic (1 ms resolution) |
| Edge interrupts | 8 rising + 8 falling (12+12 with optional SB) |
| Dimensions (W x H x D) | 90 × 100 × 75 mm |
| Weight | ~370 g |
| Protection class | IP20 |
| Programming software | TIA Portal STEP 7 (V20+) |
| Firmware | V4.7 |
| Real-time clock | ±60 s/month; typical 20 days backup |
| EAN | 4047623402701 |
Application Areas
CPU 1212C DC/DC/DC is widely used in machine automation, process control, and building automation. Its compact size makes it ideal for projects with limited panel space.
- Conveyor and transfer lines
- Filling, dosing, and packaging machines
- Water treatment and HVAC control
- Elevator and door automation
- Food and pharmaceutical production lines (IP20 panel applications)
- Small robot cells and pick-and-place systems
Memory, I/O and Performance
The 1212C is one of the smallest CPUs in the S7-1200 family with integrated I/O. The following resources are combined in a single device:
- 8 digital inputs (24 V DC) — 6 configurable as HSC
- 6 digital outputs (24 V DC) — 4 PTO/PWM pulse outputs
- 2 analog inputs (0–10 V)
- 100 KB work memory, 2 MB load memory
- 1024-byte process input/output image
High-speed counters and pulse outputs
Inputs Ia.0–Ia.5 support HSC up to 100/180 kHz; Ia.6–Ia.7 support 30/120 kHz. Outputs Qa.0–Qa.3 reach 100 kHz pulse frequency; Qa.4–Qa.5 reach 20 kHz.
Communication and Integration
The onboard PROFINET IO Controller/Device interface connects the S7-1200 CPU directly to the industrial Ethernet network. Topology can be defined in TIA Portal; HMI panels, variable frequency drives, and distributed I/O stations can be managed on the same network.
- PROFINET IO Controller and Device support
- S7 communication (PUT/GET) and Open User Communication (TCP/ISO-on-TCP)
- Diagnostics and monitoring via web server
- OPC UA (with TIA Portal and appropriate license)
- Modbus RTU/TCP (with CM1241/CM1243)
Mounting, Expansion and Accessories
CPU 1212C mounts on a 35 mm DIN rail (90 × 100 × 75 mm). Signal modules on the left increase digital/analog I/O capacity; communication modules add RS485, RS232, or PROFIBUS connectivity.
- Up to 2 signal modules (SM1221, SM1222, SM1223, SM1231, SM1232, SM1234, etc.)
- Up to 3 communication modules (CM1241 RS232/485, CM1242 GPRS, CM1243 PROFIBUS)
- Up to 1 signal board (SB) — additional digital/analog I/O or relay outputs
- SIMATIC memory card (program backup and load memory expansion)
- BA 2x35 mm rail adapter and front connector (6ES7292-1AG40-0XA0)
Ordering and Technical Support
Krafel Elektrik supplies the original Siemens CPU 1212C DC/DC/DC (order number 6ES7212-1AE40-0XB0) from stock or with fast delivery. Contact our technical team for project-based SM/CM selection, TIA Portal programming support, and commissioning assistance.
When ordering, specify the MLFB code (6ES7212-1AE40-0XB0) to ensure the correct variant (DC/DC/DC) is shipped. AC/DC/Relay (1BE40) and DC/DC/Relay (1HE40) variants have different I/O characteristics.