Tool Retraction - Siemens SINUMERIK 840D Function Manual

"Machine operating area" > "ETC key (">")" > "Retract"
Note
The softkey "Retract" is only displayed if there is retraction data and an active tool.
Selection by PLC user program
The following actions must be performed to select JOG retract by the PLC user program:
● Channel-specific query whether retraction data is available
DB21, ... DBX377.5 == 1 (retraction data available)
● Mode group-specific selection of JOG mode:
DB11, ... DBX(n*20+6).2 == 1 (active mode: JOG, with n=0, 1, 2 ... for mode group 1, 2, ...)
● Channel-specific selection of JOG retract via the PI service "RETRAC".
A detailed description of the activation of the PI service "RETRAC" via the function block FB
4 can be found in:
Further information
Function Manual PLC
● After confirmation of the selection of JOG retract (see below), select the workpiece
coordinate system:
– DB19.DBX0.7 (current coordinate system: 1 ⇒ WCS, 0 ⇒ MCS)
– DB19.DBX20.7 (Requirement: Switch over MCS/WCS)
Selection confirmation
After selecting JOG retract, the NC/PLC interface signal is set:
DB21, ... DBX377.4 = 1 (JOG retract active)
Thread cutting (G33 or G331/G332)
If the program execution was aborted during a thread cutting operation (G33 or G331/G332),
the axis grouping of tool axis and spindle is restored when JOG retract is selected. The
controller parameters and parameter sets for the axes involved are also set in accordance with
a programmed thread cutting in the part program.
17.12.4

Tool retraction

General retraction behavior
The tool is retracted by manually traversing the retraction axis (geometry axis) specified when
selecting JOG retract in the workpiece coordinate system (WCS). The retraction movement
can be performed via the traversing keys of the machine control panel (MCP) or via the
handwheel. Retraction is possible within the traversing range limits (working area limitation,
software limit switch, etc.).
The retraction movement can be stopped and started again with NC stop / NC start.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
17.12 Retraction in the tool direction (JOG retract)
H1: Manual traversing
697