| 摘要 |
<p>A group supervisory controller judges whether or not the communication of a common signal via a first transmission path is normally performed. If the communication of the common signal is not normal, the group supervisory controller switches the input destination of the common signal from the first transmission path to a second transmission path. A control panel judges whether or not the communication of the common signal via the first transmission path is normally performed. If the communication of the common signal is not normal, the control panel switches the input destination of the common signal from the first transmission path to a third transmission path. If the communication of the common signal via the first transmission path is not normal, the common signal is transmitted from a parallel-serial converter to a plurality of the control panels via the second and third transmission paths.</p> |
