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Siemens SINUMERIK 840D Operator's Manual Page 337

Computerized numerical control system for machine tools.
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PLC program memory
PLC programming
Polar coordinates
Polynomial interpolation
Position axis
Power On
Program block
Programmable frames
 Siemens AG, 2004. All rights reserved
SINUMERIK 840D/810D Operator's Guide HMI Embedded (BEM) – 03.04 Edition
Programmable Logic Control: -> Programmable Logic Controller.
Component of the -> NC control: Programmable controller for
processing the control logic of the machine tool.
-> Programmable Logic Controller
PLC user memory is used to store the PLC user program and the user
data together with the PLC basic program. The PLC user memory can
be upgraded to 96 kByte with memory expansions.
The PLC is programmed using the STEP 7 software. The STEP 7
programming software is based on the WINDOWS operating system,
and combines the STEP 5 programming functions with additional
innovative functional developments.
A coordinate system, which defines the position of a point on a plane
in terms of its distance from the zero point and the angle formed by
the radius vector with a defined axis.
With polynomial interpolation, it is possible to generate many different
curve characteristics, such as straight line-, parabolic-, and
exponential functions (SINUMERIK 840D).
Axis which performs an auxiliary movement on a machine tool (e.g.
tool magazine, pallet transport). Positioning axes are axes that do not
interpolate with -> path axes.
Switching the control off and back on again.
The preset function can be used to redefine the control zero in the
machine coordinate system. Preset does not move the axes, but a
new position value is entered for the current axis positions.
1. Control operating area
2. Sequence of instructions to the control.
Program blocks contain the main programs and subprograms for 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.


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