Siemens SINUMERIK 802D sl Programming Manual page 206

Terms
Synchronization
Synchronized actions
Synchronized axes
Synchronous spindle
System variable
B-206
Instructions in --> part programs for coordination of the operations in
different --> channels at specific machining points.
1. Auxiliary function output
While a workpiece is being machined, technological functions (-->
auxiliary functions) can be output from the CNC program to the
PLC. These auxiliary functions control, for example, ancillary
equipment on the machine tool such as the sleeve, gripper,
chuck, etc.
2. High--speed auxiliary function output
The acknowledgement times for the --> auxiliary functions can be
minimized and unnecessary halts in the machining process
avoided for time--critical switching functions.
Synchronized actions can be combined to form programs
(technology cycles). Axis programs can be started in the same IPO
cycle, for example, by scanning digital inputs.
Synchronized axes require the same amount of time to traverse
their path as --> geometry axes for their path.
Accurate angular synchronism between one master spindle and one
or more slave spindles. Enables flying transfer of a workpiece from
spindle 1 to spindle 2 on turning machines.
In addition to speed synchronism, it is also possible to program the
relative angular positions of the spindles, e.g. on--the--fly,
position--oriented transfer of inclined workpieces.
Several pairs of synchronous spindles can be implemented.
A variable which exists although it has not been programmed by the
--> part program programmer. It is defined by the data type and the
variable name, which is prefixed with $. See also --> User--defined
variable.
SINUMERIK 802D sl/840D/840D sl/840Di/840Di sl/810D ISO Milling (PGM) - - 04.07 Edition
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04.07