A
01/2008 Appendix
B Terms
© Siemens AG 2008 All rights reserved.
SINUMERIK 840Di sl/840D sl/840D Operating Manual HMI-Advanced (BAD) - 01/2008 Edition A-451
are defined.
Data word
A data unit, two bytes in size, within a → data block.
Diagnostics
1. Operating area of the control.
2. The control has both a self-diagnostics program as well as test
functions for servicing purposes: Status, alarm and service
displays.
Services
Operating area of the control.
DRF
Differential Resolver Function: NC function which generates an
incremental work offset in Automatic mode in conjunction with an
electronic handwheel.
E
Editor
The editor makes it possible to create, edit, extend, join, and import
programs/texts/program blocks.
Rapid traverse
The highest traverse rate of an axis. It is used for example to move
the tool from rest to the → workpiece contour or retract the tool from
the contour.
Electronic handwheel
Electronic handwheels can be used to traverse the selected axes
simultaneously in manual mode. The handwheel clicks are analyzed
by the increment analyzer.
External work offset
A work offset specified by the →PLC.
F
Frame
A frame is an arithmetic rule that transforms one Cartesian coordinate
system into another Cartesian coordinate system. A frame contains
the components → work offset, → rotation, → scaling, → mirroring.
G
Exact stop
With a programmed exact stop instruction, the position stated in a
block is approached precisely and very slowly, if necessary.
To reduce the approach time, → exact stop limits are defined for rapid
traverse and feed.
Exact stop limit
When all path axes reach their exact stop limits, the control responds
as if it had reached its precise destination point. The → part program
continues execution at the next block.
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