Siemens Simovert Masterdrives Compendium page 792

08.2012
9.4.38 Position correction [843]
Operating mode 1
Siemens AG 6SE7087-6QX70 (Version AN)
SIMOVERT MASTERDRIVES
Position correction enables synchronizing signals e.g. BERO proximity
switches or printing indices of optical reading devices, to be cyclically
evaluated during synchronization. The printing index is recorded by a
fast, interrupt-capable MASTERDRIVES input and the actual position at
the time of the interrupt is stored by the position sensing. If the setpoint
position stored in the MASTERDRIVES at the time of the printing index
does not correspond to the measured actual position, an automatic
compensation movement takes place at a speed specified in U667 by
means of which this deviation can be corrected.
Section 9.3.3 includes an application example for position correction
under the section "Printing index control".
A position correction is normally automatically started by the "Start
position correction" command when a new position measured value
(i.e. a measured actual position of the printing index) has been made
available by position sensing.
The following two operating modes can be set via U661:
The axis transports the printing index:
Printing indices
If the printing index comes too late, short-time acceleration has to take
place to make up the position delay again. Beforehand, the position
setpoint and actual value are set in the counter-direction in order to
create the correct reference to the mechanical system.
Compendium Motion Control
Technology Option F01
9-101