Siemens SINUMERIK 840D Function Manual page 342

S9: Setpoint switchover
11.2 Startup
DB31, ... DBX24.5 (setpoint switchover: request drive control)
Status of the drive control
The current status of drive control is displayed via:
DB31, ... DBX96.5 (setpoint switchover: drive control active)
Status signals
After drive control is assumed for the first time for one of the machine axes involved in the
setpoint switchover (DB31, ... DBX24.5 = 1 (setpoint switchover: switchover)) the following
status signals are always displayed the same for all of the machine axes involved:
DB31, ... DBB92 - DBB95
Control signals
The control signals are only active in the machine axis that currently has the drive control
(DB31, ... DBX96.5 == 1 (setpoint switchover active)):
DB31, ... DBB20 to DBB21
Controller enable
The controller enable (DB31, ... DBX2.1) is only active in the machine axis that currently has
drive control (DB31, ... DBX96.5 == 1 (status setpoint switchover))
Follow-up mode
Machine axes without drive control, involved in the setpoint switchover, are always switched
into the follow-up mode in the control itself (DB31, ... DBX61.3 == 0).
Note
Only one axis with drive control
At any one point in time, only one axis must have drive control DB31, ... DBX24.5 == 1 and
DB31, ... DBX96.5 == 1.
Special cases
Several simultaneous requests to take over
No switchover takes place for several simultaneous takeover requests. The last axis used
keeps drive control. The same effect applies if there are no takeover requests.
No takeover request when powering up
If there is no takeover request when the control powers up, then the control assigns the drive
control to the first machine axis with the same logical drive number.
MD30110 $MA_CTRLOUT_MODULE_NR[0,AX1] = 1
MD30110 $MA_CTRLOUT_MODULE_NR[0,AX2] = 2
MD30110 $MA_CTRLOUT_MODULE_NR[0,AX3] = 3
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Axes and spindles
Function Manual, 06/2019, A5E47437747B AA