Compressor Compon/Compcurv - Siemens sinumerik 840d Programming Manual

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Special Motion Commands

5.3 Compressor COMPON/COMPCURV

As a rule, CAD/CAM systems provide linear blocks

that meet the programmed accuracy.

With complex contours this leads to a considerable

amount of data and to short path sections. These

short path sections restrict the execution speed.

With the compressor a certain number (max. 10) of

these short path sections can be joined together to

form one path section.

The modal G code COMPON or COMPCURV

activates an "NC block compressor".

With linear interpolation, this function groups a

number of straight blocks (number is restricted to

10) and approaches them by means of third degree

polynomials (COMPON), or five degree polynomials

(COMPCURV), within an error tolerance range

specified via machine data. In this way, the NC

processes one large motion block rather than a large

number of small ones.

This compression operation can only be executed on

linear blocks (G1). It is interrupted by any other type

of NC instruction, e.g. an auxiliary function output,

but not by parameter calculations.

Blocks to be compressed may contain only block

number, G1, axis addresses, feed and comment.

This sequence is mandatory. Variables may not be

SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) − 04.00 Edition

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