| 摘要 |
PURPOSE:To troubleshoot easily a fault such as disconnection or short-circuit of a transmission line by using a collision supervisory device adjusting a transmission signal of fault information of the same time from each elevator so as to flicker a lamp at a fault of the transmission line. CONSTITUTION:If a fault such as disconnection or short-circuit of a transmission line 5 takes place, a power supply to a photocoupler 8 is interrupted and a transmission monitor signal S3 cannot be logical ''1''. In this case, in transmitting fault information, even when a transmission signal S2 is logical ''1'', since a transmission monitor signal S3 remains logical ''0'', an EX-OR gate 9 is opened, a dropout timer 10 is set, a transmission inhibition signal S4 is logical ''1'' to bring the level of the transmission signal to logical ''0''. Then the EX-OR gate 9 is closed, and the dropout timer 10 is turned of after a prescribed time, a transmission inhibition signal is logical 1, the transmission signal S2 becomes logical ''0'' so as to start transmission of fault information. A transmission inhibition signal S4 repeats logical ''0'', ''1'' in the period of a time limit of the dropout timer 10 and a lamp 11 repeats frickering at the same time. |
