Siemens SIMATIC S7 F - Page 191

Fail-Safe Blocks
Fail-Safe Systems
A5E00085588-03
8-3
Default
The default only specifies the first structural component, DATA. The other two
structure elements required for safety are automatically added when CFC charts
are compiled.
The same applies to the assignment of constants.
See Also
Blocks for Converting Data Between Standard and Safety Sections