Siemens SIMATIC ET 200iSP Operating Instructions Manual page 252

Digital electronic modules
12.2 Digital electronics module 4 DO
Figure 12-3
SHUT DOWN "L" output modules:
If no intrinsically safe shutdown signal is used, you must enable the "Deactivate shutdown
signal" parameter for the SHUT DOWN "L" output modules.
252
Actuator disconnection via intrinsically safe shutdown signal for SHUT DOWN "H" output
modules
Operating Instructions, 11/2017, A5E00247483-07
ET 200iSP