Siemens SIMATIC S7-1200 G2 Failsafe CPU 1212FC – Robust PLC for Safety-Oriented Automation
The Siemens SIMATIC S7-1200 G2 Failsafe CPU 1212FC (article number 6ES7212-1HF50-0XB0, EAN: 4047623414810) is a dependable failsafe programmable logic controller (PLC) from the S7-1200 G2 family for small to mid-range automation tasks. It combines standard control logic with safety functions for machine and system automation.
This CPU features 8 digital inputs (24 V DC) and 6 relay outputs (2 A) for direct connection of sensors and actuators. With up to 200 kB of program memory and 500 kB of data memory, it supports complex control and safety applications. Its compact design fits well into control cabinets and modular installations.
Networking & Communication
The integrated Ethernet/PROFINET interface enables seamless networking, communication with HMI panels, and integration into modern automation systems. This facilitates diagnostics, remote access, and efficient data exchange.
Compatibility & Expansion
This failsafe CPU is compatible with the full SIMATIC S7-1200 ecosystem, including:
- Signal and communication modules for I/O expansion
- PROFINET-enabled peripheral devices
- Siemens HMI panels for operation and visualization
- SIMATIC memory cards for data backup
Programming Environment
The controller is programmed using the Siemens TIA Portal (STEP 7 Basic/Professional). The software supports standard PLC languages such as LAD, FBD, and SCL, as well as simulation, online diagnostics, and centralized project management – ideal for efficient development and commissioning.
Why Failsafe?
The SIMATIC S7-1200 Failsafe CPU 1212FC is designed for safety-related automation tasks. Unlike standard PLCs, it processes not only control logic but also certified safety functions in accordance with international safety standards.
Failsafe means that the controller automatically switches to a defined safe state in the event of a fault – for example, safely shutting down drives or stopping a machine. This reliably protects people, machines, and equipment.
The CPU complies with key safety standards such as:
- IEC 61508 (functional safety)
- ISO 13849 (machine safety)
- SIL / Performance Level (PL)
Safety functions such as emergency stop, safety door monitoring, two-hand control, or safe stop can be implemented directly in the PLC – without the need for additional external safety relays.
The higher price compared to a standard CPU is justified by:
- certified safety-rated hardware
- redundant internal monitoring mechanisms
- special failsafe firmware architecture
- extended development, testing, and certification effort
This makes the failsafe CPU the ideal choice for applications where functional safety is legally required or technically essential – such as machine building, education, and safety-critical automation projects.
Product Datasheet
Detailed technical specifications are available in the official Siemens product documentation:
→ product datasheet (PDF)
Technical Highlights
- Siemens SIMATIC S7-1200 Failsafe CPU 1212FC (6ES7212-1HF50-0XB0)
- Supply voltage: DC 20.4–28.8 V DC
- 8 digital inputs & 6 relay outputs
- Program memory: 200 kB | Data memory: 500 kB
- Integrated Ethernet/PROFINET interface
- Programmable with Siemens TIA Portal
- EAN: 4047623414810
