Siemens SINAMICS S120 Function Manual page 236

Control of the safety functions
5.4 Control via TM54F
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
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)
• 2893
• 2894
Overview of important parameters (see SINAMICS S120/S150 List Manual)
• p10002
• p10017
• p10040
• r10051.0...9
234
WARNING
manufacturer documentation.
the "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 - Failsafe digital inputs (F-DI 0 ... F-DI 4)
SI TM54F - Failsafe 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
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Safety Integrated