Prerequisites For Synchronous Mode - Siemens SINUMERIK 840D sl Function Manual

Setpoint correction
The setpoint correction of the system variable $AA_COUP_CORR[Sn] impacts on all
subsequent following spindle programming in the same way as a position offset and
corresponds to a DRF offset in the MCS.
Example: establish correction value
If a coupling offset of 7° has been programmed using COUPON(....,77) and if a mechanical
offset of 81° has come about as a result of closing the workpiece support fixture, a correction
value of 4° is calculated:
The system variables return the following values for the following spindle:
$P_COUP_OFFS[S2] ; programmed position offset = 77°
$AA_COUP_OFFS[S2] ; setpoint-end position offset = 77°
$VA_COUP_OFFS[S2] ; actual value-end position offset approx. 77°
$AA_COUP_CORR[S2] ; correction value = 4°
14.1.4

Prerequisites for synchronous mode

Conditions on selection of synchronous mode
The following conditions must be fulfilled before the synchronous spindle coupling is
activated or else alarm messages will be generated.
● The synchronous spindle coupling must have been defined beforehand (either
● The spindles to be coupled must be defined in the NC channel in which the coupling is
● The following spindle must be assigned to the NC channel in which the coupling is
● The following applies to setpoint and actual value couplings (DV, AV):
References:
/FB1/ Function Manual Basic Functions; Spindles (S1)
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
permanently configured via machine data or according to user definition via parts
program using COUPDEF).
activated.
Channel-specific MD20070 $MC_AXCONF_MACHAX_USED
Axis-specific MD35000 $MA_SPIND_ASSIGN_TO_MACHAX
activated.
Default setting with axis-specific MD30550 AXCONF_ASSIGN_MASTER_CHAN
FS and LS must at least have a position measuring system for recording positions and
position controls must be started up.
Note
When position control is activated, the maximum setpoint speed of the LS is automatically
limited to 90% (control reserve) of the maximum speed. The limitation is signaled via IS
"Setpoint speed limited" (DB31, ... DBX83.1).
S3: Synchronous spindle
14.1 Brief description
881