Function Manual
66 01/2017
Fixed point approach in JOG
8.5.1
The machine user can use the "Approach fixed point in JOG" function to approach axis positions defined using machine data
by actuating the traversing keys of the Machine Control Panel or by using the handwheel. The traveling axis comes to a
standstill automatically on reaching the defined fixed point.
Typical applications are, for example:
● Approaching a basic position before starting an NC program.
● Travel towards tool change points, loading points and pallet change points.
● The "Approaching fixed point in JOG" can be activated only in "JOG" mode.
The function cannot be enabled in "JOG-REPOS" and JOG-REF sub-modes and in JOG in "AUTO" mode.
● The axis to be traversed must be referenced.
● A kinematic transformation may not be active.
● The axis to be traversed must not be a synchronized axis of an active coupling.
● No ASUPs are executed.
Approaching a fixed point with G75
The process for approaching defined fixed points can be activated from the part program too using the G75 command.
For more information on approaching fixed points with G75, refer to the SINUMERIK 808D/SINUMERIK 808D ADVANCED
Programming and Operating Manual, Section: "Fixed point approach".
Procedure in "Approaching fixed point in JOG"
● Selection of "JOG" mode
● Enabling the "Approach fixed point in JOG" function
● Traversing of the machine axis with traverse keys or handwheel
The PLC sets the interface signal after the "Approach fixed point in JOG" function is selected:
"JOG - Approach fixed point" (DB380x.DBX1001.0-2)
The number of the fixed point to be approached is output using bit 0 - 2 in binary code. The NC confirms activation with the
following interface signal as soon as the function takes effect:
"JOG - Approaching fixed point active" (DB390x.DBX1001.0-2)
The actual traversing is started with the traverse keys or the handwheel in the direction of the approaching fixed point.
The selected machine axis traverses till it comes to an automatic standstill at the fixed point.
The corresponding NC/PLC interface signal is sent on reaching the fixed point with "Exact stop fine":
"JOG - Approaching fixed point reached" (DB390x.DBX1001.3-5)
This display signal is also reported if the axis reaches the fixed point position in the machine coordinate system using other
methods (e.g. NC program, synchronized action) at the setpoint end, and comes to a standstill at the actual-value end within
the "Exact stop fine" tolerance window (MD36010 STOP_LIMIT_FINE)
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