Glossary
Glossary-20 Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
User memory
All programs and data such as part programs, subroutines, comments, tool offsets, work
offsets/frames, and channel and program user data can be stored in the shared CNC user
memory.
User program
User programs for S7-300 automation systems are created with the STEP 7 programming
language. The user program has a modular structure consisting of individual blocks.
The basic block types are:
• Code blocks
These blocks contain the STEP 7 commands.
• Data blocks
These blocks contain constants and variables for the STEP 7 program.
Variable definition
A variable definition includes the specification of a data type and a variable name. The
variable names can be used to access the value of the variables.
Velocity control
In order to achieve an acceptable traverse rate in the case of very slight motions per block,
an anticipatory evaluation over several blocks (→ Look Ahead) can be specified.
Working area
Three-dimensional area in which the tool tip can enter based on the design of the machine
tool. See → Protection zone.
Working area limitation
The working area limitation can be used in addition to limit switches to limit the traversing
range of axes. A pair of values can be used for each axis to describe the protected working
area.
Work offset
Specifies a new reference point for a coordinate system through reference to an existing
zero point and a → frame.
1. Settable
SINUMERIK 840D: A configurable number of settable work offsets are available for each
CNC axis. Alternatively, offsets that can be selected using G functions are active.
2. External
In addition to all offsets that specify the position of the workpiece zero, an external work
offset can be overridden by a handwheel (DRF offset) or by the PLC.
3. Programmable
Work offsets can be programmed for all path and positioning axes using the TRANS
instruction.
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