Siemens SINAMICS S120 Function Manual page 112

Control of the safety functions
6.3 Control via TM54F
F-DI features
● Fail-safe configuration with two digital inputs per F-DI
● Input filter for test signals with an adjustable suppression time (p9651/p9851)
● Configurable connection of NC/NC or NC/NO contacts by means of parameter p10040
● Status parameter r10051
● Adjustable time window for monitoring discrepancy at both digital inputs by means of
● Second digital input with additional tap of the optocoupler cathode for connecting an
In contrast to mechanical switching contacts (e.g. Emergency Stop switches), leakage
currents can still flow through semiconductor switches even when they are switched off.
This can lead to false switching states if digital inputs are not connected correctly.
The conditions for digital inputs/outputs specified in the relevant manufacturer
documentation must be observed.
In accordance with IEC 61131 Part 2, Chapter 5.2 (2008), only outputs that have a
maximum residual current of 0.5 mA when "OFF" can be used to connect TM54F digital
inputs with digital semiconductor outputs.
The inclusion of additional load resistors makes it possible to use digital outputs with larger
residual currents to connect TM54F inputs.
Overview of important parameters (see the SINAMICS S120/S150 List Manual)
● p9651 SI STO/SBC/SS1 debounce time (Control Unit)
● p9851 SI STO/SBC/SS1 debounce time (Control Unit)
● p10002 SI discrepancy monitoring time
● p10040 SI F-DI input mode
● r10051.0...9 CO/BO: SI status of digital inputs
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parameter p10002 for all F-DIs (details in Chapter: Input/output interconnections for a
safety switching device with TM54F)
M-switching output of a fail-safe controller.
WARNING
WARNING
Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
Safety Integrated