Siemens SINUMERIK 840D Operator's Manual page 489

A
03.04
Power ON
Preset
Program
Program block
Programmable frames
Programmable logic
controller
Programmable working
area limitation
Programming key
Protection zone
Q
Quadrant error
compensation
Ó Siemens AG, 2004. All rights reserved
SINUMERIK 840D/840Di/810D Operator's Guide HMI Advanced (BAD) – 03.04 Edition
The action of switching the control off and then on again.
The control zero point can be redefined in the machine coordinate
system by means of the Preset function. Preset does not cause the
axes to move; instead, a new position value is entered for the current
axis positions.
1. Control operating area
2. Sequence of instructions to the control system.
Program blocks contain the main programs and subroutines of the ->
parts programs.
Programmable -> frames can be used to define new coordinate
system starting points dynamically while the parts program is running.
A distinction is made between absolute definition using a new frame
and additive definition with reference to an existing starting point.
Programmable logic controllers (PLC) are electronic controllers whose
functions are stored as a program in the control unit. The design and
wiring of the unit are not, therefore, dependent on the control
functions. Programmable logic controllers have the same structure as
a computer, i.e. they consist of a CPU with memory, input/output
modules and an internal bus system. The I/Os and programming
language are selected according to the requirements of the control
technology involved.
Limitation of the movement area of the tool to within defined,
programmable limits.
Characters and character sequences which have a defined meaning
in the programming language for -> parts programs (see
Programming Guide).
Three-dimensional area within a -> working area which the tool tip is
not permitted to enter.
Contour errors on quadrant transitions caused by frictional fluctuations
on guideways can be largely eliminated by means of quadrant error
compensation. A circularity test is performed to parameterize the
quadrant error compensation function.
A
Appendix
B Terms
A-489