A
01/2008 Appendix
B Terms
© Siemens AG 2008 All rights reserved.
SINUMERIK 840Di sl/840D sl/840D Operating Manual HMI-Advanced (BAD) - 01/2008 Edition A-449
User program
User programs for the S7-300 automation systems are created using
the programming language STEP 7. The user program has a modular
layout and consists of individual blocks.
The basic block types are:
Code blocks: These blocks contain the STEP 7 commands.
Data blocks: These blocks contain the constants and variables for the
STEP 7 program.
User memory
All programs and data, such as part programs, subprograms,
comments, tool offsets, and zero offsets/frames, as well as channel
and program user data, can be stored in the shared CNC user
memory.
Working area limitation
With the aid of the working area limitation, the traversing range of the
axes can be further restricted in addition to the limit switches. One
value pair per axis may be used to describe the protected working
area.
Working area
Three-dimensional zone into which the tool tip can be moved on
account of the physical design of the machine tool.
See also → Protection zone.
Working memory
The working memory is a RAM area in the → CPU which is accessed
by the processor to access the user program during program
execution.
Archive
Reading out data and/or directories to an external memory device.
A spline
The Akima spline runs under a continuous tangent through the
programmed interpolation points (3rd order polynomial).
Automatic
Operating mode of the control (block sequence operation according to
DIN): Operating Mode in NC systems in which a → part program is
selected and continuously executed.
B
Basic coordinate system
Cartesian coordinate system which is mapped by transformation onto
the machine coordinate system.
In the → part program, the programmer uses the axis names of the
basic coordinate system. The basic coordinate system exists in
parallel to the → machine coordinate system when no →
transformation is active. The difference between the systems relates
to the axis identifiers.
Baud rate
Rate of data transfer (Bit/s).
Machining channel
Via a channel structure, parallel sequences of movements, such as
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