Transferring Safe Position Values (Sp); Safe Referencing - Siemens SINAMICS S120 Function Manual

3.3.3

Transferring safe position values (SP)

The "Safe Position (SP)" function enables you
to transfer safe position values to the higher-
level fail-safe controller (F-CPU) via PROFIsafe
(telegram 901 or 902).
On the F-CPU side, you can also calculate the
current speed from the change in position per
time. In telegram 902, the values are transferred
in 32-bit format, in telegram 901, in 16-bit for-
mat.
After parameter assignment, enabling and POWER ON, the function is automatically
selected. The drive transfers the value. Please observe the following:
● For use as the safe absolute position, the "Absolute position" must also be enabled and
then safely homed.
● To allow the controller to continue using the transferred position, the actual position value
must be valid.
Using the time stamp that is also transferred, you can also calculate the velocity from the
position values. If you only want to calculate the speed, just enable the "Transfer of safe
position values" without the "Absolute position."
Details and parameterization
For further details and information on how to parameterize this function, see Chapter
"Transferring safe position values (SP) (Page 185)".
3.3.4

Safe referencing

The "safe referencing" function allows a safe absolute position to be defined. This safe
position is used for the following functions:
● Safely-Limited Position (SLP) (Page 64)
● Transferring safe position values (SP) (Page 65)
● Safe Cam (SCA) (Page 67)
Safety Integrated
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Overview of Safety Integrated functions
3.3 Safety Integrated Advanced Functions
65