Acceleration Margin (Channel-Specific); General Information; Parameterization; Path-Acceleration Limitation (Channel-Specific) - Siemens SINUMERIK 840D sl Function Manual

Further information
System variable
The acceleration reduction (set using ACC), currently active in the channel, can be read on
an axis-for-axis basis using:
$AA_ACC[<axis>]
Reset response
The acceleration reduction set using ACC can be kept after a channel reset or after the end
of the program. The parameterization is performed via:
MD32320 $MA_DYN_LIMIT_RESET_MASK
5.2.4

Acceleration margin (channel-specific)

5.2.4.1

General Information

General information
Under normal circumstances, preprocessing makes maximum use of the parameterized
maximum values of the machine axes for the purpose of path acceleration. In order that an
acceleration margin may be set aside for overlaid movements, e.g., within the context of the
"Rapid lift away from the contour" function, path acceleration can be reduced by a
programmable factor. When, for example, a factor of 0.2 is applied, preprocessing will only
use 80% of the maximum possible path acceleration. 20% is set aside as an acceleration
margin for overlaid movements.
5.2.4.2

Parameterization

Parameters for the acceleration margin are assigned for each channel by means of machine
datum:
MD20610 $MC_ADD_MOVE_ACCEL_RESERVE
(acceleration margin for overlaid motions)
5.2.5

Path-acceleration limitation (channel-specific)

5.2.5.1 General Information
General Information
To enable a flexible response to the machining situations concerned, setting data can be used
to limit the path acceleration calculated during preprocessing for specific channels:
SD42500 $SC_SD_MAX_PATH_ACCEL (maximum path acceleration)
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
B2: Acceleration
5.2 Functions
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