Siemens SINUMERIK 840D sl Function Manual page 1230

S1: Spindles
16.3 Reference / synchronize
The signal runtime compensation is set by means of the machine data:
● MD31122 $MA_BERO_DELAY_TIME_PLUS
(BERO delay time for a positive direction of motion)
● MD31123 $MA_BERO_DELAY_TIME_MINUS
(BERO delay time for a negative direction of motion)
The effect depends on the setting in machine data:
MD34200 $MA_ENC_REFP_MODE (referencing mode)
MD34200 = 7
MD34200 = 2
Note
Signal propagation delays are preset on delivery so that the content generally does not have
to be changed.
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 procedure, see Section "R1: Referencing (Page 1149)".
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.
1230
The setting MD34200 $MA_ENC_REFP_MODE = 7 only executes posi‐
tion synchronization at a velocity/speed which is fixed in machine data:
MD34040 $MA_REFP_VELO_SEARCH_MARKER (reduced velocity)
The zero mark is not automatically sought, it has to be requested explicitly
with the 0-1 edge of the NC/PLC interface signal:
DB31, ... DBX16.4/5 (resynchronize spindle 1/2*)
* 1/2 stands for the selected measuring system.
)
The velocity defined in MD34040 is also effective when referencing in
JOG-REF mode and through the part program with G74.
Setting MD34200 $MA_ENC_REFP_MODE = 2 executes position syn‐
chronization without specifying a specific velocity/speed.
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions