| 摘要 |
PURPOSE:To prevent burning on the fluorescent screen of a CRT due to a long-time display of the same contents on the CRT in normal operation wherein no alarm is generated and to prolong the life of the CRT when alarm generation and alarm contents are displayed on the CRT at the time of the alarm generation. CONSTITUTION:A CRT display control part 3 is provided with an information receiving circuit 4 which receives information sent from a monitor part 2 and a decision 8 on whether the information received by the information receiving circuit 4 is alarm generation information or alarm reset information is made; when it is decided that the received information is the alarm generation information, the CRT 10 is turned on through software, but when the received information is the alarm reset information, the CRT 10 is turned off through the software. |
