2.3 Safety functions of the F-PLC
The safety functions of the F-PLC are predominantly implemented in the software. The safety
functions are executed by the F-system to bring the system into a safe state if a hazardous
event takes place – and to maintain it in this safe state.
These safety functions are mainly included in the following components:
● In the safety-relevant user program (safety program) in the PLC with active F-capability
(F‑PLC)
Users only program the user safety function. The safety function for the process itself can
be implemented using a user safety function - or a fault response function. If, in the case of
a fault, the F‑system can no longer execute the actual user safety function, then it executes
the fault response function: for example, the associated outputs are shut down, and the
F‑PLC goes into the STOP mode, if necessary.
● In the failsafe inputs and outputs (F‑I/O)
The F-I/O guarantees the safety-relevant processing of information from the field (sensors:
e.g. EMERGENCY STOP pushbuttons, light barriers; actuators, e.g. motor controls). It has
all of the necessary hardware and software components for safety-relevant processing,
corresponding to the specified safety class.
Fundamentals
2.3 Safety functions of the F-PLC
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB 23
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