| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a CTC system where information is looped back assuredly without creating an isolated station device even if a failure occurs on two station devices in a configuration where information is sent in a loop to a plurality of station devices from a central device. <P>SOLUTION: Each of transmission components 4A and 4B of a central device 1 and a plurality of station devices 2<SB>1</SB>to 2<SB>n</SB>is connected in series by a transmission line 3 in a loop, a bypass route 16 for each transmission component 4A and 4B is placed on the line 3, and a back contact 15a of an electromagnetic relay 15 is placed on the bypass route 16, and when failure or power-outage occurs at the transmission component 4A and 4B, the electromagnetic relay 15 comes in to a non-excitation state and the back contact 15a is turned ON and the bypass route 16 is opened and the transmission component of a station device where the failure has occurred is bypassed to transmit information. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
