Siemens SINUMERIK 840D sl Function Manual page 186

H1: Manual and handwheel travel
4.9 Approaching a fixed point in JOG
Requirements
● The "Approaching fixed point in JOG" can be activated only in the JOG mode.
The function cannot be activated if the machine function JOG-REPOS or JOG-REF is active
and in JOG in AUTOMATIC.
● The axis to be traversed must be referenced.
● A kinematic transformation may not be active.
● The axis to be traversed may not be a following axis of an active coupling.
Procedure
Procedure in "Approaching fixed point in JOG"
1. Selection of JOG mode
2. Enabling the "Approach fixed point in JOG" function
3. Traversing of the machine axis with traverse keys or handwheel
Activation
After selecting the "Approach fixed point in JOG" function, the PLC outputs the number of the
fixed point to be approached binary coded to the NC using the following bits:
DB31, ... DBX13.0-2 (JOG approach fixed point)
The NC confirms the activation with the interface signal as soon as the function is effective:
DB31, ... DBX75.0-2 (JOG approach fixed point active)
Note
Activation is not possible:
● during an NCK reset
● In case of impending emergency stop
● During processing of an ASUP
No alarm message occurs. Delayed activation takes place after closure or after
acknowledgement of the active function.
Sequence
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 reported on reaching the fixed point with "Exact
stop fine":
DB31, ... DBX75.3-5 (JOG approach fixed point reached)
This display signal is also signaled if the axis reaches the fixed point position in the machine
coordinates system via other methods e.g. NC program, FC18 (for 840D sl) or synchronized
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Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions