Siemens SINUMERIK 840Di sl Operating Manual page 449

A
01/2008
User program
User memory
Working area limitation
Working area
Working memory
Archive
A spline
Automatic
B
Basic coordinate system
Baud rate
Machining channel
© Siemens AG 2008 All rights reserved.
SINUMERIK 840Di sl/840D sl/840D Operating Manual HMI-Advanced (BAD) - 01/2008 Edition
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.
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.
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.
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.
The working memory is a RAM area in the → CPU which is accessed
by the processor to access the user program during program
execution.
Reading out data and/or directories to an external memory device.
The Akima spline runs under a continuous tangent through the
programmed interpolation points (3rd order polynomial).
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.
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.
Rate of data transfer (Bit/s).
Via a channel structure, parallel sequences of movements, such as
A
Appendix
B Terms
A-449