Siemens SINUMERIK 840C Installation Instructions Manual page 197

6 NC Machine Data (NC MD), NC Setting Data (NC SD) 12.93
6.1.4 Breakdown of NC MDs/drive machine data
Active in
10
Feed after block search
next block
Default value Lower input limit Upper input limit Units
1 000 units/
1 000 +0 100 000
min (IS)
If the machining program is started via a block search at a particular block rather than from the
beginning, it is possible that the programmed rate will not match the travel (G95 or G96 active
although no spindle is rotating; extremely low F value programmed).
Should the axes be at any position other than at the starting point of the first block selected in
the block search, the control would output the programmed rate of the traversing block. Since
this could result in some very unusual situations, the axes are traversed to the first start
position following a block search with the value specified in NC MD 10 (with G94).
Position before block search
F = MD 10
N20
N10
N30
Start
End
Example
Note carefully!
MD 10 has no effect on a block search with G00.
The programmed feedrate from the part program is always used to
traverse to the end point of the target block if the value 0 is
entered in NC MD 10.
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Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)