| 摘要 |
PURPOSE:To perform a proper abnormality processing corresponding to input data by providing the second central processing unit which starts an abnormality processing program when a flag is set for checked data. CONSTITUTION:Analog quantities of output voltage and current fields of a generator G as a controlled system are inputted to a programmable controller PC through a converter CONV to monitor the state of the generator G, and the programmable controller PC outputs control outputs corresponding to operation states successively in accordance with a program to control the generator G. In this case, the second central processing unit CPU-2, which sets a flag for input data if this input data is abnormal, is provided besides the first central processing unit CPU-1, and the flag of data is checked by a flag check instruction, and the abnormality processing program is started if the flag is set for data, but a set program operation is performed if data is normal. |
