Synchronization And Online Positioning By Mcbsp Signals - Scanlab RTC6 PCIe Board Installation And Operation Manual

9.3.4 Synchronization and
Online Positioning
Signals
Instead of incremental encoders, the movement
between the workpiece and the scan system can be
synchronized using absolute position data via the
McBSP interface.
Alternatively, this interface also allows the alignment
of the workpiece relative to the (stationary)
scan system ("Online Positioning").
The input value most recently fully transmitted at the
McBSP interface can be queried by read_mcbsp. In
addition, the RTC6 PCIe Board automatically
evaluates the current input value if execution of the
laser scan processes is controlled as follows:
• For Processing-on-the-fly-applications (see
Chapter 8.6 "Processing-on-the-fly", page
the coordinate values of all
"Arc" Commands are transformed in accordance
with the current input value.
• By the list command wait_for_mcbsp, further
execution of a list can be postponed until the
input value has reached, overstepped or
understepped a predefined value.
• By Online Positioning (see
""Local Online Positioning"", page 228
Chapter 8.3.2 ""Global Online Positioning"",
page 231), the scan system is aligned in
accordance with the current input values.
RTC6 boards
Doc. Rev. 1.0.21 en-US
9 Programming Peripheral Interfaces
by McBSP
242),
Vector Command and
Chapter 8.3.1
and
Notes
• To compensate linear motion, Cartesian
coordinates can be forwarded by the
McBSP interface. Compensation of rotational
motion, on the other hand, requires transmission
of angle positions. During evaluation, full
revolutions are suppressed as long as the input
values do not exceed the allowed value range (20
full circles, see set_mcbsp_rot).
• The signals at the McBSP interface
impact on the track delay, which can be defined
Starts (by simulate_ext_start,
for External
set_ext_start_delay or
set_ext_start_delay_list).
have no
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