Siemens SINUMERIK 840D sl Function Manual page 192

Connecting sensors and actuators
8.2 Connecting I/O via PROFIsafe
Figure 8-12
Note
If mixed 2f2 and 1f1 parameterization is used in an F-DI module, this can reduce the number
of SPL input data $A_INSE/INSEP that can be used. This is the reason that we recommend
that 1f1 is first parameterized followed by 2f2.
If more pieces of F-net data of an F-DI module are used then the number of relevant bits that
can be transferred by parameterizing the channels of the F-DI module, then this is
recognized by the control.
Example:
For a 2f2 parameterization of all of the channels of the F-DI module:
● ET 200S F-DI module: 4/8 F-DI 24 V DC
The 8 transferred F-net data bits contain 4 relevant (bit 0 - bit 3) and 4 non-relevant bits (bit 4
- bit 7).
F-DO module
The NCK/PLC-SPL outputs $A_OUTSE/OUTSEP are logically combined in the F-driver to
produce an F-net data signal (implicit 2f2 parameterization) and mapped to the channels of
the relevant F-DO module.
Figure 8-13
PROFIsafe clock cycle and communication cycle time
When parameterizing the PROFIsafe clock cycle to ensure a correct PROFIsafe
communication, the cyclic bus communication time must be observed. For the PROFIBUS bus
system, this time can be determined as follows:
192
2f2/1f1 mapping of the F-DI channels to SPL input data
Mapping the SPL output data to F-DI channels
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
not
Safety Integrated