公开(公告)号：EP0553349A4

公开(公告)日：1994-08-10

申请号：EP91914609

申请日：1991-08-16

申请人： HITACHI SEIKO KK

发明人： MAKINO TOSHIYUKI ,  YAMAGUCHI TUYOSHI

IPC分类号： G05B19/418 ,  G05B19/417

CPC分类号： G05B19/4181 ,  G05B2219/34376 ,  Y02P90/06

摘要： A main central processing unit (CPU) and a plurality of CNC units each corresponding to each of machine tools are connected to each other through a bus line, and the main CPU is connected to an external storage device and an external input device. To change the operational control of a machine tool and the processing data for a workpiece, a new system program is downloaded to a CPU for a CNC unit from the external storage device through the RAM of the main CPU, and normally, a PERT program including the processing data stored in the CPU for the CNC unit is changed.