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Siemens SINUMERIK 810D Function Manual

Siemens SINUMERIK 810D
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Detailed description
2.4 LookAhead
Basic logic functions: Continuouspath Mode, Exact Stop, LookAhead (B1)
44 Function Manual, 11/2006, 6FC5397-0BP10-2BA0
2.4 LookAhead
Function
LookAhead is a procedure in continuouspath mode (G64, G641) that achieves velocity
control with LookAhead over several NC part program blocks beyond the current block.
If the program blocks only contain very small paths, a velocity per block is achieved that
permits deceleration of the axes at the block end point without violating acceleration limits.
This means that the programmed velocity was not actually reached although a sufficient
number of prepared blocks with virtually tangential path transitions was available.
With the LookAhead function it is possible to plan the acceleration and deceleration phase
with approximately tangential path transitions in order to achieve a higher feedrate with
shorter distances. Deceleration to velocity limits is possible with LookAhead such that
violation of the acceleration and velocity limit is prevented.
111111111111
)
)HHG
SURJUDPPHG
%ORFNSDWK
*/RRN$KHDGYHORFLW\FRQWURO
*&RQVWDQWYHORFLW\SKDVHFDQQRWEHDFKLHYHG
Figure 2-12 Comparison of velocity response with exact stop G60 and continuouspath mode G64
with LookAhead with short traversing paths.
LookAhead takes plannable velocity limits into consideration such as:
Exact stop at block end
Velocity limit in the block
Acceleration limit in the block
Velocity limit on block transition
Synchronization with block change at block transition.

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Siemens SINUMERIK 810D Specifications

General IconGeneral
BrandSiemens
ModelSINUMERIK 810D
CategoryControl Unit
LanguageEnglish

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