| 摘要 |
PROBLEM TO BE SOLVED: To correctly detect short-circuit of a light control signal line independently for every system without causing a cost increase, in an illumination light control system to dimly control a plurality of systems of luminaire groups by transmitting a light control signal from a light control device. SOLUTION: The light control signal S is transmitted to each of the light control signal lines La, Lb, Lc, Ld, and a luminaire group connected to each of the light control signal lines La, Lb, Lc, Ld individually emits light in accordance with the on-duty of the light control signal S. If short-circuit st occurs in the light control signal line Lc at the time t1, a short-circuit detecting signal Ps is output, transmission of the light control signal S to each light control signal line is stopped system by system in order of the control signal line La, Lb, Lc, Ld, The light control device confirms whether or not generation of the short-circuit detecting signal Ps is stopped at the time t3, t4, t5 when transmission of the light control signal S to each of the light control signal lines La, Lb, Lc, Ld is stopped, and specifies the light control signal line Lc in which short-circuit has occurred based on the timing (t4) when the output of the short-circuit detecting signal Ps stops. COPYRIGHT: (C)2009,JPO&INPIT |
