Siemens SINUMERIK 840D Function Manual page 772

S1: Spindles
18.3 Reference / synchronize
● The spindle can be synchronized from the motion (after M3 or M4) using SPOS, M19
or SPOSA.
The responses are as follows:
– With SPOS=<Pos>, SPOS=DC(<Pos>) and SPOS=AC(<Pos>), the direction of motion
– With SPOS = ACN(<Pos>) or SPOS = ACP(<Pos>), the position is always
● Crossing the zero mark in JOG mode by means of direction keys in speed control mode.
Note
It does not make any difference whether the synchronization procedure is initiated from the
part program, FC 18 or synchronized actions.
Note
During synchronization of the spindle, all four possible reference point values are effective
depending on the measuring system selected. The measurement system offset has the
same effect.
The following machine data must be observed:
● MD34080 $MA_REFP_MOVE_DIST
● MD34090 $MA_REFP_MOVE_DIST_CORR
● MD34100 $MA_REFP_SET_POS
If a non-referenced spindle with SPOS=IC(...) and a path < 360 degrees is positioned, it
may be the case that the zero mark is not crossed and the spindle position is still not
synchronized with the zero mark. This can happen:
● After POWER ON
● By setting the axial NC/PLC interface signals:
Special features when synchronizing using a contactless proximity switch
The position error caused by the signal delay when using a contactless proximity switch can be
corrected internally in the NC by entering a signal runtime compensation.
The signal runtime compensation is set by means of the machine data:
● MD31122 $MA_BERO_DELAY_TIME_PLUS
(delay time of the contactless proximity switch, positive motion direction)
● MD31123 $MA_BERO_DELAY_TIME_MINUS
(delay time of the contactless proximity switch, negative motion direction)
The effect depends on the selected referencing mode:
772
is retained and the position is approached.
approached with a negative or positive direction of motion. If necessary, the direction of
motion is inverted prior to positioning.
(Reference point distance / destination point for a distance-coded system)
(Reference point offset / absolute offset, distance-coded)
(Reference point value, with distance-coded system without any significance)
DB31, ... DBX17.5 (resynchronize spindle when positioning 2)
DB31, ... DBX17.4 (resynchronize spindle when positioning 1)
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA