Siemens SINUMERIK 840D Function Manual page 659

In addition to five fixed increment sizes (default setting: INC1, INC10, INC100, INC1000 and
INC10000), a variable increment size (INCvar) that can be set via the setting data is also
available.
Fixed increments
The parameter assignment of the fixed increment sizes is performed via NC-specific machine
data:
MD11330 $MN_JOG_INCR_SIZE_TAB[1 ... 5] = <number of increments 1 ... 5>
Variable increment
The parameter assignment of the variable increment size is performed via NC-specific setting
data:
SD41010 $SN_JOG_VAR_INCR_SIZE = <number of increments>
Distance evaluation of one increment
The distance evaluation of one increment for fixed and variable increment sizes is performed
via the axis-specific machine data:
MD31090 $MA_JOG_INCR_WEIGHT = <distance>
Note
Input of a negative value results in a reversal of the handwheel direction of rotation.
Limitation of the increment size
The machine operator can limit the size of the selected increment:
● For machine axes, using the axis-specific machine data:
MD32080 $MA_HANDWH_MAX_INCR_SIZE (limiting the selected increment)
● For geometry axes, using the channel-specific machine data:
MD20620 $MC_HANDWH_GEOAX_MAX_INCR_SIZE (limitation of handwheel increment
for geometry axes)
● For orientation axes, using the channel-specific machine data:
MD20621 $MC_HANDWH_ORIAX_MAX_INCR_SIZE (limitation of handwheel increment
for orientation axes)
Representation of the handwheel number in the NC/PLC interface signals
The representation of the handwheel number in the NC/PLC interface signals is defined using
machine data:
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
H1: Manual traversing
17.6 Manual traversing using a handwheel
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