Siemens SINAMICS DCM User Manual page 76

Connection circuit diagrams for the switching devices
3SK1121-2CB4x basic device advanced
①
Top cover
②
Top cover; inner labeling
③
LEDs
④
Sets the delay time
⑤
DIP switch
⑥
SET/reset button
⑦
Bottom cover
⑧
Bottom cover; inner labeling
➈
Data matrix code
➉
Device identification label
76
Application document for functional safety STO, SS1 (ISO 13849-1)
Compact User Manual, 09/2016, A5E34871844AM