Siemens SINAMICS S120 Function Manual page 101

Forced dormant error detection F-DI/F-DO of TM54F through test stop
An automatic test stop function is available for forced dormant error detection within the
F-DIs/DOs test.
To ensure that the test stop function of the TM54F can be used, the F-DIs that are used
must be interconnected in accordance with the following wiring example. The digital inputs of
F-DI0 to F-DI4 must be connected to the "L1+" power supply. The digital inputs of F-DI5 to
F-DI9 must be connected to the "L2+" power supply.
Safety Integrated
Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
Safety Integrated Extended Functions
5.13 Forced dormant error detection
101