| 摘要 |
PURPOSE:To enable the priority selection of operator callout trunk corresponding to the relay board not in operation, by constituting one selective condition with the display of operation state of relay board and the operator callout trunk usage state display. CONSTITUTION:When all the relay boards ATT are in operation, the selection signal is fed to the selection and catch circuit of each operator callout trunk OPCT via the X connection at the final end of the chain circuit of brake contact id1 of the operation state display relay from the brake side of each contact id0. Accordingly, only the selection signal concerning the operator callout trunk OPCT having closed busy display relay contact b not in busy state is received at the trunk selection circuit TSEL. |
