Siemens SINUMERIK 840D sl Function Manual page 969

Program block
Program blocks contain the main program and subprograms of → part programs.
Program level
A part program started in the channel runs as a → main program on program level 0 (main
program level). Any part program called up in the main program runs as a → subprogram on
a program level 1 ... n of its own.
Programmable frames
Programmable → frames enable dynamic definition of new coordinate system output points
while the part program is being executed. A distinction is made between absolute definition
using a new frame and additive definition with reference to an existing starting point.
Programmable logic controller
Programmable logic controllers (PLCs) are electronic controllers, 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 controller. The programmable logic control 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.
Programmable working area limitation
Limitation of the motion space of the tool to a space defined by programmed limitations.
Programming key
Characters and character strings that have a defined meaning in the programming language
for → part programs.
Protection zone
Three-dimensional zone within the → working area into which the tool tip must not pass.
Quadrant error compensation
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.
R parameters
Arithmetic parameter that can be set or queried by the programmer of the → part program for
any purpose in the program.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Glossary
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