Continuous Path Mode, Exact Stop and LookAhead (B1)
3.4 Continuous-path mode
Turning, Milling, Nibbling
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Function Manual, 11/2012, 6FC5397-1CP10-5BA0
3.4
Continuous-path mode
3.4.1
General
In continuous path mode, the path velocity is not decelerated for the block change in order to
permit the fulfillment of an exact stop criterion. The objective of this mode is to avoid rapid
deceleration of the path axes at the block-change point so that the axis velocity remains as
constant as possible when the program moves to the next block. To achieve this objective,
the "LookAhead" function is also activated when continuouspath mode (G64) is selected.
Continuouspath mode causes:
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Rounding of the contour.
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Shorter machining times through elimination of braking and acceleration processes that
are required to comply with the exact-stop criterion.
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Improved cutting conditions as the velocity is more uniform.
The continuous-path mode is suitable if a contour is to be traversed as quickly as possible.
Continuous-path mode is suitable if:
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A contour is to be traversed precisely.
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An absolutely constant velocity is required.
Implicit exact stop
In some cases, an exact stop needs to be generated in continuouspath mode to allow the
execution of subsequent actions. In such situations, the path velocity is reduced to zero.
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If auxiliary functions are output before the traverse motion, the previous block is only
terminated when the selected exact-stop criterion is fulfilled.
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If auxiliary functions are to be output after the traverse motion, they are output after the
interpolator end of the block.
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If an executable block contains no travel information for the path axes, the previous block
is terminated on reaching the selected exact stop criterion.
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A block is terminated on interpolator end if the following block contains the changeover of
the acceleration profile BRISK/SOFT.
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If the function "Empty buffer" (STOPRE) is programmed, the previous block is terminated
when the selected exact stop criterion is reached.