Startup - Siemens SINUMERIK 840D sl Function Manual

S9: Setpoint switchover

7.2 Startup

7.2 Startup
The "setpoint exchange" function is required in applications in which a single motor needs to
drive a number of axes/spindles such as, for example, on milling machines with special
millheads. The spindle motor is operated as both a tool drive and a millhead orienting
mechanism.
Figure 7-1
Figure 7-2
Configuration
Setpoint exchange enables a number of axes to use the same drive.
The same setpoint channel on this drive is assigned a number of times to define the axes
participating in setpoint exchange. For this, the following machine data must be pre-assigned
with the same logical drive number for every axis:
MD30110 $MA_CTRLOUT_MODULE_NR (setpoint assignment: module number)
Note
Alarm 26018 is output if the option is missing.
The encoder assignment is programmed in machine data:
MD30230 $MA_ENC_INPUT_NR
(actual-value assignment: Input on drive module/measuring circuit module)
406
Example 1: 1 motor encoder, extra encoder for millhead
Example 2: 1 motor encoder, separate millhead encoder and spindle encoder
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions