Siemens SINUMERIK 840C Operator's Manual page 298

01.99
User program
Vocabulary words
Workpiece
Workpiece contour
Workpiece
coordinate system
Workpiece zero
© Siemens AG 1999 All Rights Reserved
SINUMERIK 840C, OEM Version for Windows (BA)
User programs for the PLC in the 840 C are written in the STEP 5
programming language. The user program is of modular structure and consists
of various blocks.
The fundamental block types are:
Program blocks (OBs, PBs, FBs, FXs, SBs): these blockss contain the STEP 5
commands
Data blocks (DBs, DXs): these blocks contain constants and variables for the
STEP 5 program.
Words used in a programming language with defined notation and meaning
Words with defined notation within initialisation files. The values assigned to
the various vocabulary words are used as initialisation parameters for the
associated application.
•
Part to be made or machined by the machine tool.
•
A workpiece is the name given to a directory in which programs and other
data such as main programs, initialisation file, tool offsets (see data
structure description) are stored. The workpieces are in turn stored in a
directory.
Desired contour of the workpiece to be made/machined.
The workpiece coordinate system has its origin in the workpiece zero point.
When programming in the workpiece coordinate system, dimensions and
directions refer to this system.
The workpiece zero (workpiece zero point, workpiece datum) represents the
origin for the workpiece coordinate system. It is defined by distances to the
machine zero.
12 Abbreviations / Glossary
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