前段见到一台意大利的镗铣床，X、Y、Z、A、B、C、SP 7个轴，其中C轴和SP轴共用一套驱动器和电机，通过齿盘离合器进行切换，而且C轴还是2.5度/齿的分度轴，C轴第二编码器还不是1：1直联，而是通过一级齿轮减速。甚是好奇！
传动布局
研究一下发现使用的西门子840d的一个选项功能：Setpoint Exchange。需要单独购买。但确实大大简化了机械结构，并省去C轴驱动器和电机成本。目前国内大型镗铣床据说也开始采用。
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. Machine data MD 30110:
CTRLOUT_MODULE_NR must be pre-assigned with the same logical drive number for every axis.
The setpoint is exchanged and the corresponding interface signals are evaluated in the PLC user program.
At any one time, only one of the machine axes with the appropriate logical drive number may have control via the setpoint channel of the drive.
Requests to transfer drive control are sent using DB31–..., DBX24.5.
The current drive control state is indicated in DB31–..., DBX96.5.
Access rights to the shared drive must be managed in the PLC user program.
The following example illustrates a possible setpoint exchange sequence.
PLC切换流程
主轴有三档，C轴运行要在1档。两个轴参数独立，驱动器参数通过PLC进行切换，以适应不通过工况。
注：
The setpoint exchange implemented in NCK SW 7.1 and higher differs from the compile cycles solution described in TE5 as follows. These differences must be taken into account during installation and start-up and when creating the PLC user program:
� Machine data MD 63750: CTRLOUT_CHANGE_TAB is no longer used.
� The meanings of associated PLC interface signals have changed. Therefore, PLC user programs must be updated accordingly.
� Alarms 70451 and 70452 are no longer used.
� Setpoint exchange with simulated axes MD 30130: CTRLOUT_TYPE=0 is no longer supported.
� Known restrictions of the technology card function no longer apply.
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