Siemens SINUMERIK 840Di Function Manual page 2000

Detailed Description
2.16 Feeds (V1)
DB21, ...
DBB5 Rapid traverse override
Edge evaluation: no
Signal state 1 or The rapid traverse override can be entered via the PLC in either the binary or Gray code.
edge change For binary coding, the rapid traverse override is interpreted as a %.
0 → 1 0% to 100% feed changes are possible, in accordance with the binary value in the byte.
The following permanent assignment applies:
Binary values > 100 are limited to 100%.
Using the machine data:
MD12100 $MN_OVR_FACTOR_LIMIT_BIN (limit for binary-coded override switch),
the maximum rapid traverse override can be additionally limited.
With Gray coding, the individual switch settings are assigned to the following codes:
2-136
Signal(s) updated: cyclic
NC/PLC Interface Signals (Z1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0