Function Of The F-Do - Siemens SINAMICS S120 Function Manual

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Unwanted movement due to incorrect signal states as a result of diagnostic currents in the

switched-off state (logical state "0" or "OFF")

Unlike mechanical switching contacts, e.g. emergency stop switches, diagnostic currents can

also flow when the semiconductor is in the switched-off state. If interconnection with digital

inputs is faulty, the diagnostic currents can result in incorrect switching states. Incorrect signal

states of digital inputs can cause unwanted movements of machine parts and result in serious

injury or death.

● Observe the conditions of digital inputs and digital outputs specified in the relevant

● Check the conditions of the digital inputs and digital outputs with regard to currents in the

More information on this topic is available on the Internet at: Parameterizing and configuring

safety hardware (https://support.industry.siemens.com/cs/ww/en/view/39700013).

Function diagrams (see SINAMICS S120/S150 List Manual)

Overview of important parameters (see SINAMICS S120/S150 List Manual)

● r10051.0...9

Function of the F-DO

Fail-safe digital outputs (F-DO) consist of 2 digital outputs and 1 digital input that checks the

switching state for the forced checking procedure (test stop). The 1st digital output switches

24 V DC, and the 2nd switches the ground of the power supply of X514 (TM54F).

The status of each F-DO can be read at parameter r10052. The status of the associated DI can

be read at parameter r10053 (only available for TM54F_SL (TM54F Slave Module)).

Drive functions

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

manufacturer documentation.

"OFF" state and, if necessary, connect the digital inputs to suitably dimensioned, external

resistors to protect against the reference potential of the digital inputs.

SI TM54F - fail-safe digital inputs (F-DI 0 ... F-DI 4)

SI TM54F - fail-safe digital inputs (F-DI 5 ... F-DI 9)

SI TM54F F-DI switchover discrepancy time

SI TM54F digital inputs debounce time

SI TM54F F-DI input mode

CO/BO: SI TM54F digital inputs, status

Safety Integrated Basic Functions

11.9 Control via TM54F