Siemens Sinumerik 840D sl Function Manual page 213

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Note
If mixed 2v2 and 1v1 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 1v1 is first parameterized followed by 2v2.
If more pieces of F net data of an F--DI module are used then the number relevant
bits that can be transferred by parameterizing the channels of the F--DI module,
then the control does not recognize this.
Example:
For a 2v2 parameterization of all of the channels of the F--DI module:
-- ET 200S F, 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 $A_OUTSE/OUTSEP are logically combined in the
F driver to produce an F net (useful) data signal (implicit 2v2 parameterization) and
mapped to the channels of the relevant F--DO module.
Figure 7-13 Mapping the SPL output data to F--DO channels
PROFIsafe clock cycle and communication cycle time
When parameterizing the PROFIsafe clock cycle to ensure a correct PROFIsafe
communication, the cyclic bus communication time must be observed. For the
PROFIBUS bus system, this time can be determined as follows:
DP cycle time
After the station has been fully configured, the DP cycle time can be determined by
activating the equidistant (isochronous) bus cycle:
Open the properties dialog box of PROFIBUS DP master of the configured station
in HW Config:
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
ET 200S F--DO module SINUMERIK 840D sl
Channel 0
Channel 1
Channel 2
Channel 3
Connecting Sensors/Actuators
7.2 Connecting I/O via PROFIsafe
AND OUTSEP[n])
($A_OUTSE[n]
OUTSEP[n+1])
AND
($A_OUTSE[n+1]
($A_OUTSE[n+2] AND OUTSEP[n+2])
AND
OUTSEP[n+3])
($A_OUTSE[n+3]
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