Siemens SINUMERIK 840D Operator's Manual page 165

A
03.04
User program
V
Variable definition
Velocity control
Vocabulary words
W
Working area
Working area limitation
Working memory
Workpiece
Workpiece contour
Workpiece coordinate
system
 Siemens AG, 2004. All rights reserved.
SINUMERIK 840D/840Di/810D Operator's Guide Handheld Terminal 6 (BAH) - 03.04 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.
A variable definition includes the specification of a data type and a
variable name. Variable names can be used to access the value of
the variables.
In order to be able to achieve an acceptable traversing velocity on
very short traverse movements within a single block, predictive
velocity control can be set over several blocks (-> look ahead).
Words with a specific notation, which have a defined meaning in the
programming language for -> parts programs.
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.
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.
The working area is a RAM area in the -> CPU which is accessed by
the processor to access the user program during program execution .
Part to be created/machined by the machine tool.
Setpoint contour of the -> workpiece to be created/machined.
The starting position of the workpiece coordinate system is the ->
workpiece zero. In machining operations programmed in the
workpiece coordinate system, the dimensions and directions refer to
this system.
A
Appendix
B Terms
A-165