Automatic Selection And Deselection Of Position Control - Siemens SINUMERIK 840D sl Function Manual

S3: Synchronous spindle
14.2 Programming of synchronous spindle couplings
Reading the programmed angular offset
The position offset last programmed between the FS and LS can be read in the NC part
program by means of the following axial system variables:
$P_COUP_OFFS[<axial expression>]
Note
After cancellation of the servo enable signal when synchronous operation and follow-up
mode are active, the position offset applied when the controller is enabled again is different
to the originally programmed value.
$P_COUP_OFFS only returns the value originally programmed. $AA_COUP_OFFS and
$VA_COUP_OFFS return the current value. The programmed offset can be recreated with
NST DB31, ... DBX31.4 (re-synchronization).
14.2.4

Automatic selection and deselection of position control

Behavior in speed control mode
In DV coupling mode, program instructions COUPON, COUPONC and COUPOF, COUPOFS are
used to activate and/or deactivate position control for the leading spindle as required. If there
are several following spindles on the leading spindle, then in speed-controlled mode, the first
DV activates coupling position control for the leading spindle and the last DV coupling
deactivates coupling position control for the leading spindle if SPCON is not programmed.
The leading spindle does not need to be located in the same channel as the following
spindle.
Automatic selection with COUPON and COUPONC
Depending on the coupling type, the effect of COUPON and COUPONC on the position control
for synchronous operation is as follows:
Coupling type
Following spindle FS
Leading spindle LS
The position control is activated by a COUPON and COUPONC instruction if at least one
1
following spindle has been coupled to it with coupling type DV.
898
DV
Position control ON
Position control On
1
AV
Position control ON
No action
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
VV
No action
No action
Extended Functions