Siemens SINUMERIK 828D Function Manual page 1770

Glossary
program or any → cycle can be called up as a subprogram within another part program. It then runs through in
the next → program level (x+1) (subprogram level (x+1)).
Synchronization
Statements in → part programs for coordination of sequences in different → channels at certain machining
points.
Synchronized Actions
1. Auxiliary function output
During workpiece machining, technological functions ( → auxiliary functions) can be output from the CNC
program to the PLC. For example, these auxiliary functions are used to control additional equipment for the
machine tool, such as quills, grabbers, clamping chucks, etc.
2. Fast auxiliary function output
For time-critical switching functions, the acknowledgement times for the → auxiliary functions can be
minimized and unnecessary hold points in the machining process can be avoided.
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".
Syntax
$SC_IS_SD_MAX_PATH_JERK =
System memory
The system memory is a memory in the CPU in which the following data is 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.
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Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions