Siemens SINUMERIK Series Function Manual page 268

K3: Compensations
4.4 Interpolatory compensation
Function
The parameterization of the sag compensation function is done by setting system variables
of the form: $AN_CEC ...
These system variables are normally set via a part program that processes the NCK in a
certain channel. The channel axis name can be used in the variables
$AN_CEC_OUTPUT_AXIS or $AN_CEC_INPUT_AXIS. This way, each axis of the channel
can be addressed, even if it is in a different NCU.
A program in Channel 2 can couple Axis ZZ with Axis XX via the following setting (the setting
is valid for the table with the number 0):
$AN_CEC_INPUT_AXIS[0] = (XX)
$AN_CEC_OUTPUT_AXIS[0] = (ZZ)
This way AX3 on NCU-1 is "coupled" with AX2 on NCU-2 (see configuration 1).
The following variants can be used to parameterize if the axes to be coupled are on two
different channels:
● Version 1: "Programming with channel axis name":
● Version 2: "Programming with machine axis name":
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Two different part programs TP1 and TP2 are created, they are then processed in
different channels.
Axis "ZZ" is coupled to "XR":
View from the part program TP1 in Channel 1:
$AN_CEC_INPUT_AXIS[0] = (XR)
View from the part program TP2 in Channel 2:
$AN_CEC_OUTPUT_AXIS[0] = (ZZ)
Axis AX2 on NCU2 is coupled with Axis AX1 on NCU1 upon restart after TP1 is executed
in Channel 1 and TP2 is executed in Channel 2.
One part program is created that runs in any convenient channel of NCU1 and specifies
the machine axis names together with the NCU numbers.
Axis "ZZ" is coupled to "XR":
$AN_CEC_INPUT_NCU[0]=1
$AN_CEC_INPUT_AXIS[0] = (AX1)
$AN_CEC_OUTPUT_NCU[0]=2
$AN_CEC_OUTPUT_AXIS[0] = (AX2)
The NCK monitors whether the axes on the local NCU have actually been interpolated,
i.e. there is a channel that can program these axes. The local NCU is always the NCU on
which the part program runs.
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
Extended Functions