| 摘要 |
PURPOSE:To reset malfunctioning points, by releasing all cross points positioned on incoming and outgoing lines concerning desired cross points and by closing desired cross points after. CONSTITUTION:If cross point X2, Y2 is point to be closed, the switch control circuit resets all cross points X2Y1, X2Y2...X2YQ and X1Y2, X2Y2... XPY2 by pulse trains R1-Rn before closing cross point X2Y2. After that, the switch control circuit closes desired cross point X2Y2 by pulse S. Therefore, since cross points positioned on incoming and outgoing lines concerning the desired cross point are cleared at the closing time even if they malfunction due to noise before the cross point control, the contact trouble which is apt to occur in a switch of this type is reduced. |
