Select SCA
Select the SCA function using the PROFIsafe control word S_STW2.23. For SCA, you must
use telegram 903, in which control word S_STW2 and status word S_ZSW_CAM1 are available
for SCA.
Cam synchronization
For transmission of the cam status word via PROFIsafe to the F host, the cam signals of the two
monitoring channels are synchronized. Monitoring is also performed as to whether a different
output cam signal from the second channel is plausible. If the drive detects an error, it outputs
the message C01711 with the fault value 1014.
As the position tolerance for monitoring the output cam positions, the tolerance for the cross-
check of the actual position between the two monitoring channels in p9542 ("Actual value
comparison tolerance") is used.
Transmission via PROFIsafe
After SCA has been parameterized and selected, the monitoring results are transmitted in
status word S_ZSW_CAM1 (see Chapter "S_ZSW_CAM1 (Page 372)").
Function diagrams (see SINAMICS S120/S150 List Manual)
● 2826 SCA (Safe Cam)
● 2844 S_ZSW_CAM1 Safety status word Safe Cam 1
Overview of important parameters (see SINAMICS S120/S150 List Manual)
● p9501 SI Motion enable safety functions (Control Unit)
● p9503 SI Motion SCA (SN) enable (Control Unit)
● p9505 SI Motion SP modulo value (Control Unit)
● p9536[0...29] SI Motion SCA (SN) plus cam position (Control Unit)
● p9537[0...29] SI Motion SCA (SN) minus cam position (Control Unit)
● p9540 SI Motion SCA (SN) tolerance (Control Unit)
● p9542 SI Motion actual value comparison tolerance (crosswise) (Control Unit)
● r9703.0...31 CO/BO: SI Motion SCA status signal (Control Unit)
● r9708[0...5] SI Motion diagnostics safe position
● r9720.23 CO/BO: SI Motion drive-integrated control signals:
Deselect SCA
● r9727 SI Motion user agreement inside the drive
● r9771.22 SI shared functions: SCA supported
Safety functions integrated in the drive
4.16 SCA
Safety Integrated (with SINAMICS S120)
184 Commissioning Manual, 02/2020, A5E46305916B AB
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