Siemens SINUMERIK 840D Function Manual page 773

MD34200 $MA_ENC_REFP_MODE = <value>
<Value> Meaning
Note
Generally, no change is required as signal runtimes and signal runtime compensation are
preset when the system is delivered.
Referencing sequence
If the spindle is to be programmed in axis mode directly after controller power-up, it must be
ensured that the axis is referenced.
When the controller is switched on, the spindle can be referenced (condition is one zero mark
per revolution).
For information about the referencing sequence, see Section "R1: Referencing (Page 291)".
The rotary axis is referenced at the same time as the spindle is synchronized (see section
"Synchronization procedure") if the position measuring system used for the spindle is also used
for the rotary axis.
Position measurement systems, spindle
The spindle can be switched from spindle mode to axis mode (rotary axis) if a single motor is
used for spindle mode and axis mode.
The spindle (spindle mode and axis mode) can be equipped with one or two position
measurement systems. With two position measurement systems, it is possible to assign one
position measurement system to the spindle and the other to the rotary axis, or to assign two
position measurement systems to the spindle. Where two position measurement systems are
provided, both are updated by the controller, but only one can be active.
The active position measuring system is selected with the NC/PLC interface signal:
DB31, ... DBX1.5 / 6 (position measuring system 1 / 2)
The active position measurement system is required for the following functions:
● Position control of the spindle (SPCON)
● Spindle positioning (SPOS, M19 and SPOSA)
● Thread cutting (G33, G34, G35)
● Tapping without compensating chuck (G331, G332)
● Revolutional feedrate (G95)
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
2 The position is synchronized without entering a specific starting velocity/speed.
7 As starting velocity to synchronize the position, the velocity from the following machine data
is used:
MD34040 $MA_REFP_VELO_SEARCH_MARKER (creep velocity)
The zero mark is not automatically looked for, it has to be requested explicitly with the 0/1
edge of the NC/PLC interface signal:
DB31, ... DBX16.4 / 5 (resynchronize spindle, measuring system 1 / 2)
S1: Spindles
18.3 Reference / synchronize
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