自己写，西门子直流调速器２台并联控制，速度与励磁调节系统，里包括一个完整封装的USS通信库，可以用到SIMENSE的其它驱动产品中去-Write, Siemens DC drives 2 parallel control, speed and excitation control system, to include a complete package of USS communication library, you can use SIMENSE to other drives in