Siemens SIMATIC PCS 7 Operating Manual page 132

Configuring the safety program
7.10 Operating and changing safety-related parameters on a PCS 7 OS
The CFC chart in this example shows how a REAL value is entered as a simulation value for
an "F_CH_AI" block with the MOS function. The first BOOL value is used for the switchover
of the "F_CH_AI" block in "Simulation" mode. First enter an appropriate simulation value.
With the second BOOL value a fault at the channel driver is acknowledged.
Both BOOL values are reset after 4h.
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Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB