Siemens Sinumerik 840D sl Function Manual page 98

Basics on the safety functions integrated in the system/drive
5.4 Actual value conditioning
Saved stop position
The saved stop position data is combined with the permanently saved user agree-
ment to form the previous history.
The following must be noted when the stop position is saved:
The following applies when SE/SN is active:
S The stop position is cyclically saved.
S If the axis is moved with the system powered--down, then the saved stop posi-
tion no longer matches the current position.
As described under "axis safely referenced" the "axis safely referenced" state can
also be achieved using a saved and set user agreement and a saved stop position.
The following conditions must be fulfilled:
S The saved user agreement must be available.
S The difference between the "reference position" (power--on position with abso-
lute measuring systems or reference position for incremental measuring
systems) and the saved stop position (including the traversing distance to the
reference point with ERN) must be within a tolerance window specified using
the appropriate machine data.
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
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