| 摘要 |
<p>PURPOSE:To prevent an erroneous operation by a plant operator by alarm-displaying abnormality in a process plant and abnormality in the power source of a plant abnormality detecting part to detect the abnormality in the process part in different colors in one alarm displaying window. CONSTITUTION:When the abnormality occurs in the process plant, the abnormality is detected by a plant abnormality detecting part 12, the alarm displaying lamp at an applicable alarm displaying window 15 is conducted and lighted by a lamp lighting switch 13, and the abnormality in the process plant is alarm-displayed. On the other hand, when the abnormality occurs in the power source of the plant abnormality detecting part 12, the abnormality is detected by a power source abnormality detecting part 17, a power source abnormality detected signal is given to a lamp change-over switch 14, and the change-over contact is switched to another contact at a power source abnormality displaying lamp lighted side. Consequently, a power source abnormality displaying lamp having a different luminescent color from that of the alarm displaying lamp at the alarm displaying window 15 is lighted, and it is alarm-displayed that the alarm by the alarm displaying window 15 is caused by the abnormality in the power source of the detecting part. Thus, the erroneous operation can be prevented.</p> |
