Siemens SINUMERIK 840Di sl Programming Manual page 545

Standard cycles
Standard cycles are provided for machining operations, which are frequently repeated:
• Cycles for drilling/milling applications
• for turning technology
The available cycles are listed in the "Cycle support" menu in the "Program" operating area.
Once the desired machining cycle has been selected, the parameters required for assigning
values are displayed in plain text.
Subblock
Block prefixed by "N" containing information for a machining step such as position data.
Subprogram
Sequence of statements of a → part program that can be called repeatedly with different
defining parameters. The subprogram is called from a main program. Every subprogram can
be protected against unauthorized read-out and display. → Cycles are a form of subprogram.
Synchronization
Statements in → part programs for coordination of sequences in different → channels at
certain machining points
Synchronized actions
1. Auxiliary function output
2. Fast auxiliary function output
Synchronized axes
Synchronized axes take the same time to traverse their path as the geometry axes take for
their path.
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
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
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.
For time-critical switching functions, the acknowledgement times for the → auxiliary
functions can be minimized and unnecessary hold points in the machining process
avoided.
Glossary
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