| 摘要 |
PURPOSE:To realize a perfect maintenance/inspection, by making the effect of the contact output delivered outside from a digital output device invalid by the control contact and in this case securing a manual generation of the contact output. CONSTITUTION:The switch SW5 and the switch SW6 of manual control are provided to the relay board 30 to separate the control subject 2 from the control contact 1a of the digital output device 1. The SW6 gives a manual on-off control to the subject 20 when the contact 1a is separated from the subject 2. A coupling operation is secured between the switches SW5 and SW6 in a single action, and either one of the switches is always closed to avoid a simultaneous opening or closing of them. At the same time, the switch SW7 is provided to give an on-off control to the subject 20 when the SW6 is closed. As a result, the device 1 can be separated from the control subject although the device 1 has some fault, and thus a test becomes possible by giving a manual on-off control to the subject 20 by the SW7. Thus a perfect maintenance/inspection is ensured. |
