Siemens SINUMERIK 840D sl Configuration Manual page 170

Safety configuration
9.4 Parameterization of relevant properties
PLC properties
Safety Integrated settings are available in the PLC properties if the NCU uses a safety mode.
Figure 9-6 Fail-safety in the PLC properties - the "F-activation" section is inactive (grayed-out) because the F-activation is
controlled via the selection of the Safety Integrated mode in the NCU properties.
Loading the changed Safety Integrated mode into the hardware
If the actual hardware has been operated in Safety Integrated plus (F-PLC) mode and you
now want to load a configured hardware configuration with changed Safety Integrated mode,
you must perform a general reset of the PLC prior to the loading.
Further information
General information on the Safety Integrated modes can be found in the following sections:
● Safety Integrated (SPL)
● Safety Integrated (F-PLC)
Note also the following documents with information on Safety Integrated:
● Function Manual, SINUMERIK Safety Integrated
● Function Manual, SINUMERIK Safety Integrated plus
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SINUMERIK STEP 7 Toolbox V14 SP1
Configuration Manual, 05/2017, A5E41846325