Siemens SINAMICS S120 Function Manual page 176

Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
Safety devices
When the appropriate safety devices are implemented (e.g. protective doors), it can be
assumed that running machinery will not pose any risk to personnel. The user is therefore
only informed that the forced checking procedure (test stop) is due in the form of an alarm,
which requests the user to perform forced checking procedure (test stop) at the next possible
opportunity.
Examples of when the forced checking procedure (test stop) must be performed:
● When the drives are at a standstill after the system has been switched on (POWER ON).
● Before the protective door is opened.
● At defined intervals (e.g. every 8 hours).
● In automatic mode (time and event dependent).
Note
Preconditions
STO is triggered when a test stop is carried out for the Safety functions. It is not permissible
that STO is selected before selecting the test stop.
When blocksize Power Modules are used, the test stop must be triggered under controlled
standstill conditions (speed setpoint setting of 0, current is flowing through the motor).
Forced checking procedure (test stop) F-DI/F-DO of TM54F
An automatic test stop function is available for the forced checking procedure (test stop) to
test the F-DI/F-DO.
To ensure that the test stop function of the TM54F can be used, the F-DIs that are used
must be interconnected according to the following wiring example. The digital inputs of F-
DI 0 to F-DI 4 must connected to the "L1+" power supply. The digital inputs of F-DI 5 to F-
DI 9 must connected to the "L2+" power supply.
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Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Safety Integrated