Siemens Sinamics S120 Manual page 11

Ground symbols
Table 2
Power Units in Booksize C/D-Type Format
Manual, 01/2017, 6SL3097-4AC20-0BP1
Symbols
Symbol Meaning
Connection for protective conductor (PE)
Ground (e.g. M 24 V)
Connection for function potential bonding
Preface
11