Selection - Siemens SINUMERIK 840D Function Manual

H1: Manual traversing
17.12 Retraction in the tool direction (JOG retract)
17.12.3

Selection

Function
Requirement
The selection of JOG retract is only possible, if valid retraction data is available for the relevant
channel, the channel is in JOG mode and in the "Reset" state:
● DB21, ... DBX377.5 == 1 (retraction data available)
● DB11 DBX(n*20+6).2 == 1 (active mode: JOG, with n=0, 1, 2 ... for mode group 1, 2, ...)
● DB21, ... DBX35.7 == 1 (channel state: Reset)
Axes and spindles
All active measuring systems of the machine axes involved in the retraction in the tool direction
must be in the "referenced" or "restored" state when the control is switched on again (Power
On).
A detailed description of the automatic restoration of actual positions after the next start of the
control (Power On) can be found in:
Further information
R1: Referencing (Page 291)
Axis interchange
If all the axes and spindles involved in the retraction are not assigned to the channel at the time
of selection, an implicit axis interchange is performed for the missing axes.
Coordinate system
With the selection of JOG retract, the workpiece coordinate system (WCS) is set for the
traversing of the channel axes. Axes involved in the retraction can only be traversed in the
WCS. All axes that are not involved in the retraction can also be traversed in the machine
coordinate system (MCS).
Selection options
The selection of JOG retract can be supported through automatic selection of the JOG mode
after Power On. The actual selection of JOG retract is performed through manual selection via
the user interface or via the PLC user program.
Automatic selection of JOG mode
If the automatic selection of JOG retract is parameterized (see Section: "Automatic selection of
JOG retract after Power On (Page 695)") and there is retraction data for a channel after control
run-up (Power On), JOG mode is selected for the mode group.
Selection via the user interface
The selection of JOG retract is performed on the user interface via:
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Axes and spindles
Function Manual, 06/2019, A5E47437747B AA