Siemens SINUMERIK 840D sl Function Manual page 906

Synchronous Spindles (S3)
14.4 Special features of synchronous mode
Angular offset LS/FS
If there must be a defined angular offset between the FS and LS, e.g. when synchronous
operation is activated, the "zero degree positions" of the FS and LS must be mutually
adapted. This can be done with the following machine data:
● MD34100 $MA_REFP_SET_POS
● MD34080 $MA_REFP_MOVE_DIST
● MD34090 $MA_REFP_ MOVE_DIST_CORR
References:
/FB1/ Function Manual, Basic Functions, Reference Point Approach (R1)
Service display for FS
The following values are displayed for the following spindle for start-up in synchronous
operation in the "Service Values Axes" display in the "Diagnosis" operating area:
● Actual deviation between setpoints of FS and LS
● Actual deviation between actual values of FS and LS
References:
/BAD, BEM/ HMI Advanced/Embedded, Service display, Section "Service drive"
906
Value displayed: Position offset in relation to leading spindle (setpoint)
(value corresponds to angular offset between FS and LS that can be read with axis
variable $AA_COUP_OFFS in the parts program)
Value displayed: Position offset in relation to leading spindle (actual value)
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions