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Siemens SINUMERIK 840D Operator's Manual Page 338

Computerized numerical control system for machine tools.
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A
Appendix
B
Terms
Programmable logic
controller
Programmable working
area limitation
Programming key
Protection zone
Q
Quadrant error
compensation
R
R parameters
Rapid traverse
Reference point
approach
A-338
Programmable logic controllers (PLC) are electronic controls, the
function of which is stored as a program in the control unit. This
means that the layout and wiring of the device do not depend on the
function of the control. The programmable logic controller has the
same structure as a computer; it consists of a CPU (central module)
with memory, input/output modules and an internal bus system. The
peripherals and the programming language are matched to the
requirements of the control technology.
Limitation of the motion space of the tool to a space defined by
programmed limitations.
Characters and character sequences, which have a defined meaning
in the programming language for -> parts programs (see programming
guide).
Three-dimensional space within the -> working area which the tool tip
is not permitted to enter.
Contour errors at quadrant transitions, which arise as a result of
changing friction conditions on the guideways, can be virtually entirely
eliminated with the quadrant error compensation. Parameterization of
the quadrant error compensation is performed by means of a circuit
test.
Arithmetic parameter for which the programmer of the -> parts
program can freely assign or request values in the program.
The highest speed of an axis. It is used for example to move the tool
from rest position to the -> workpiece contour or retract the tool from
the contour.
If the utilized distance measuring system is not an absolute value
encoder then it is necessary to perform a reference point approach to
ensure that the actual values returned by the measuring system
match the machine coordinate values.
SINUMERIK 840D/810D Operator's Guide HMI Embedded (BEM) – 03.04 Edition
A
03.04
 Siemens AG, 2004. All rights reserved

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