公开(公告)号：US10018983B2

公开(公告)日：2018-07-10

申请号：US14906175

申请日：2014-07-14

申请人： Mitsubishi Electric Corporation

发明人： Takuro Tsuji ,  Satoru Ukena ,  Koichi Ishida

IPC分类号： G05B15/00 ,  G05B19/05

CPC分类号： G05B19/056 ,  G05B19/054 ,  G05B2219/13004

摘要： A PLC system includes a programmable logic controller including a PLC unit and a storing unit and an arithmetic-expression-data-creation supporting apparatus causing the PLC unit to create arithmetic expression data of an arithmetic expression to be executed by the PLC unit, and the arithmetic-expression-data-creation supporting apparatus includes an input unit to receive, from a user, the arithmetic expression including input information serving as a variable used in an arithmetic operation and a constant used in the operation and an arithmetic-expression processing unit to obtain a calculation sequence of the expression, and the storing unit retains an arithmetic-expression-data table for managing the arithmetic expression data including the input information, the constant and the calculation sequence, and the PLC unit includes an operation unit connected to the storing unit, to execute an arithmetic operation of the arithmetic expression according to the calculation sequence using the input information and the constant.

公开(公告)号：US09869988B2

公开(公告)日：2018-01-16

申请号：US14888741

申请日：2014-03-07

申请人： Mitsubishi Electric Corporation

发明人： Hiroshi Abe ,  Satoru Ukena ,  Koichi Ishida

IPC分类号： G05B19/05

CPC分类号： G05B19/05 ,  G05B19/054 ,  G05B2219/1126 ,  G05B2219/1176

摘要： An analog input unit as an analog unit attached to a PLC includes an A/D converting unit as a first converting unit performing conversion between an analog value and a digital value according to a first conversion characteristic, a shared memory as a retaining unit retaining a conversion characteristic table indicating a second conversion characteristic of conversion between digital values, and a conversion processing unit as a second converting unit converting a digital value according to the second conversion characteristic by referring to the conversion characteristic table. The conversion characteristic table includes combinations of a first value that is a digital value and a second value that is a conversion result of the first value, the number of which corresponds to resolution of a digital value in the analog unit, and the second value of each of the combinations of the first value and the second value can be adjusted.