Siemens SINUMERIK 828D Function Manual page 1288

S1: Spindles
16.3 Reference / synchronize
Position restoration with POWER ON
For spindles with incremental position measuring systems, it is possible to buffer the actual values after a
POWER OFF and after POWER ON, to restore the position last buffered before switching-off, in order that
position-dependent functions such as e.g. transformation can be restored (see "Position restoration with POWER
ON [Page 1220]"). One application is e.g. tool retraction after POWER OFF when machining with tool orientation
(see ""Restoration of position after POWER OFF [Page 1218]").
The following NC/PLC interface signals display the state of the position measuring system after position
restoration:
DB31, ... DBX71.4 ("Restored 1") for position measuring system 1
DB31, ... DBX71.5 ("Restored 2") for position measuring system 2
Once the tool has been retracted in the JOG mode, axes whose positions have been restored are referenced. As
a consequence, signals DB31, ... DBX71.4/5 ("Restored 1/2") are deleted and signals DB31, ... DBX60.4/5
("Referenced/synchronized 1/2") are set.
Note
If machine data MD20700 $MC_REFP_NC_START_LOCK is set to a value of "2", then an
NC start is also possible with "restored" axis positions (in the MDI mode or when
overstoring).
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Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions