| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To suppress occurrence of data failure alarm when performing online maintenance of a field device. <P>SOLUTION: Online maintenance means 103 notifies an error suppression instruction for suppressing data-value failure error treatment relating to re-read data from the field device 50 accompanied with information during online maintenance to an input-output device 102 when receiving an online maintenance starting request from an engineering device 40, while the input-output device 102 passes a status of re-read data from the field device 50 to a control task as an initialized manual request within a period when the information during online maintenance and the error suppression instruction are notified. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
