Siemens SINUMERIK 840Di Function Manual page 2008

Detailed Description
2.16 Feeds (V1)
DB31, ...
DBB19 Spindle override
Signal state 1 or With Gray coding, the individual switch settings are assigned to the following codes:
edge change
0 → 1
The factors listed in the table for spindle override are stored in the machine data:
MD12070 $MN_OVR_FACTOR_SPIND_SPEED [n]
The table contains the default settings.
The number of possible switch settings for standard machine control panels is described in the
Configuring Guides for 840D/810D.
Corresponding to .... DB 31, ... DBX1.7 (override active)
MD12070 $MN_OVR_FACTOR_SPIND_SPEED [n] (evaluation of the spindle override switch)
MD12100 $MN_FACTOR_LIMIT_BIN (limit for binary-coded override switch)
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NC/PLC Interface Signals (Z1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0