| 摘要 |
PURPOSE:To detect automatically a release defect of a trunk relay, by providing a means, which stores that the trunk is idle, and a means, which stores operation information of the trunk relay, in the trunk release defect detecting circuit. CONSTITUTION:Storage position information of the trunk is supplied to trunk release memory MT. Operation information SCN of the trunk relay is supplied to trunk relay operation information memory MS. The output of trunk relay operation information memory MS is applied to AND circuit AD together with release trunk storage position information. Only when the trunk relay is operated, this AND circuit AD outputs trunk storage position information TENSDATA and leads it to the central control device. When the relay is operated though the trunk is idle, trunk storage position information is detected from the output of the AND circuit. |
