Siemens SINUMERIK 840D sl Function Manual page 191

F-parameters: F-monitoring time
The F-monitoring time defines the maximum time that is tolerated when a PROFIsafe
component is waiting for a new F-telegram from its communication partner.
Note
If the F-monitoring time is configured to be shorter than the PROFIsafe monitoring clock cycle
set using the appropriate machine data, when the control runs-up an alarm is displayed:
Alarm 27242 "PROFIsafe: F-module %1, %2 faulty
Parameters: DO/DI channel x
The channels of an F-module are parameterized in the properties dialog box under:
Dialog: Properties
Tab: Parameter
Parameter > module parameter > DO or DI channel x
F–DI module
Depending on the selected parameterization, the channels of the F-DI module are mapped
differently to the NCK/PLC-SPL inputs $A_INSE/INSEP.
● 2f2 parameterization
For 2f2 parameterization, the process signals of both channels in the F-DI module are
combined to form one F-useful (net) data signal and thus supply data for an SPL input.
Figure 8-11
● 1f1 parameterization
For 1from1 parameterization, the process signals of both channels are transferred from the
F-DI module and can thus supply 2 different SPL input data.
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
2f2 mapping of the F-DI channels to SPL input data for ET 200S
Connecting sensors and actuators
8.2 Connecting I/O via PROFIsafe
191