A
Appendix 01/2008
B Terms
© Siemens AG 2008 All rights reserved.
A-456 SINUMERIK 840Di sl/840D sl/840D Operating Manual HMI-Advanced (BAD) - 01/2008 Edition
2. 840D:
- Operating area of the control.
- Arithmetic parameter for which the programmer of the part
program can assign or request values as required in the
program.
PG
Programming device
PLC
Programmable Logic Control: → Programmable logic controller.
Component of the → NC control: Programmable controller for
processing the control logic of the machine tool.
PLC programming
The PLC is programmed with STEP 7 software. STEP 7 programming
software is based on the standard WINDOWS operating system and
incorporates the functionality of STEP 5 programming with innovative
expansions and developments.
PLC program memory
SINUMERIK 840D: The PLC user program, the user data and the
basic PLC program are stored together in the PLC user memory. The
PLC user memory can be expanded up to 96 KB with memory
expansions.
Polar coordinates
A coordinate system, which defines the position of a point on a plane
in terms of its distance from the origin and the angle formed by the
radius vector with a defined axis.
Polynomial interpolation
Polynomial interpolation provides a means of generating a very wide
range of curves, including straight-line, parabolic and exponential
functions (SINUMERIK 840D).
Positioning axis
xis that 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.
Power On
Control is switched off and then switched on again.
Preset
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.
Program
1. Operating area of the control.
2. Sequence of instructions to the control.
Programmable working
area limitation
Limitation of the motion space of the tool to a space defined by
programmed limitations.
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