Siemens Sinamics CU240D-2 DP Operating Instructions Manual page 163

If you control the safety functions in the inverter via failsafe digital inputs, then you must
check as to whether the failsafe digital inputs are in some instances interconnected with a
"standard" function.
Procedure
1. Select the screen for the digital inputs.
2. Remove all interconnections of the digital inputs that you use as failsafe digital input F-DI:
3. You must delete the digital input connections for all CDS if you use the switchover of the
command data sets (CDS).
You can find a description of the CDS switchover in the operating instructions.
You have ensured that the failsafe digital inputs only control the safety functions in the
inverter.
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Converter with the control units CU240D-2
Operating Instructions, 04/2018, FW V4.9 SP10, A5E34262100B AF
Advanced commissioning
6.11 Safe Torque Off (STO) safety function
161