Siemens SINUMERIK 840D Operator's Manual page 158

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Appendix
B Terms
Path feed
Path velocity
PLC
PLC programming
PLC program memory
Polar coordinates
Polynomial interpolation
Positioning axis
Power On
Preset
Program
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Path feed acts on -> path axes. It represents the geometrical sum of
the feeds on the participating -> geometry axes.
The maximum programmable path velocity depends on the input
resolution. For example, with a resolution of 0.1 mm the maximum
programmable path velocity is 1000 m/min.
-> Programmable Logic Controller. Component of the -> NC control:
Programmable controller for processing the control logic of the
machine tool.
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.
• SINUMERIK FM-NC: PLC user memory of the CPU 314 is used to
store the PLC user program and the user data together with the
PLC basic program. On the
S7-CPU314 version a user memory of 24 kByte is available for this
purpose.
• SINUMERIK 840D: 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.
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.
SINUMERIK 840D/840Di/810D Operator's Guide Handheld Terminal 6 (BAH) - 03.04 Edition
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03.04
 Siemens AG, 2004. All rights reserved.