Siemens SINUMERIK 840D sl Function Manual page 2180

Glossary
Synchronized axes
Synchronized axes take the same time to traverse their path as the geometry axes take for
their path.
Synchronized axis
A synchronized axis is the → gantry axis whose set position is continuously derived from the
motion of the → leading axis and is, thus, moved synchronously with the leading axis. From
the point of view of the programmer and operator, the synchronized axis "does not exist".
System memory
The system memory is a memory in the CPU in which the following data are stored:
• Data required by the operating system
• The operands times, counters, markers
System variables
A variable that exists without any input from the programmer of a → part program. It is
defined by a data type and the variable name preceded by the character $. See → User-
defined variable.
Text editor
See → Editor
TOA area
The TOA area includes all tool and magazine data. By default, this area coincides with the
→ channel area with regard to the reach of the data. However, machine data can be used to
specify that multiple channels share one → TOA unit so that common tool management data
are then available to these channels.
TOA unit
Each → TOA area can have more than one TOA unit. The number of possible TOA units is
limited by the maximum number of active → channels. A TOA unit includes exactly one tool
data block and one magazine data block. In addition, a TOA unit can also contain a
toolholder data block (optional).
Tool
Active part on the machine tool that implements machining (e.g., turning tool, milling tool,
drill, LASER beam, etc.).
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Basic logic functions: Appendix
Function Manual, 11/2006, 6FC5397-0BP10-2BA0