| 摘要 |
PURPOSE:To enable bidirectional bus control in which a function of one unit stops, but other functions operate by arranging plural units of bidirectional bus interface parts individually, by dividing peripheral devices into plural units in correspondence to the arranged interface parts, and giving the same device numbers. CONSTITUTION:A control bus interface part (CBI)A13 is led into a control bus 12 whih has a Device No. field (DNF), etc., as an information line from a central controller (CC)11, and controls a 1:1 switch A15 which accomodates Circuit Nos.0 to 31. An answer signal is sent back to the CC11 through the control bus 12 from the switch A15. A CBI.B14 controls Circuit Nos.32 to 63 by receiving a Device No. field, etc., from the CC11 in the same way. In this way, switches whose Circuit Nos. are 0 to 63 can be controlled by the same Device Nos. by data field values at normal time. Even if the function of the CBI.A stops due to obstacles, switches B16 whose Circuits Nos. are 32 to 63 can be controlled with no trouble by the CBI.B. |
